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		<h1>CHƯƠNG IV - OXI- KHÔNG KHÍ</h1>
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			<div style="text-align: center;"><span style="font-size:26px;"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="line-height:150%">CHƯƠNG IV</span></u></b><b><span style="line-height:150%">:OXI- KHÔNG KHÍ</span></b></span></span></span></div>
<br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu1:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Hãy cho biết 3.10<sup>24</sup><sub> = </sub>30.10<sup>23 </sup>phâ n tử &nbsp;oxi có khối lượng bao nhiêu gam:</span></span></span></span></span><br />
<br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. 120g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. 140g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:red">C.160g </span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.150g</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 2:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Đốt cháy 3,1g photpho trong bình chứa 5g oxi.sau phản có chất nào còn dư?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Oxi&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Photpho&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Hai chất vừa hết&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Không xác định được</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu3:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Phát biểu nào sau đây về oxi là <b><i><u>không</u></i></b> đúng?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A.Oxi là phi kim hoạt động hoá học rất mạnh, nhất là ở nhịêt độ cao</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%"><span style="color:red">B.Oxi tạo oxit axit với hầu hết kim loại</span></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C.Oxi không có mùi và vị</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">D.Oxi cần thiết cho sự sống</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 4:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Cho phản ứng: C + O<sub>2</sub> -&gt; CO<sub>2</sub>. Phản ứng trên là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Phản ứng hoá học&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Phản ứng toả nhiệt</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Phản ứng oxi hoá- khử&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color:red">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D. Tất cả các ý trên đều đúng</span></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 5:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Quá trình nào dưới đây <u>không làm giảm lượng</u> oxi trong không khí?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Sự gỉ của các vật dụng bằng sắt&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Sự cháy của than, củi, bếp ga</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%"><span style="color:red">C. Sự quang hợp của cây xanh&nbsp; </span></span></span><span style="font-size:14.0pt"><span style="line-height:150%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D. Sự hô hấp của động vật</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 6:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Dãy oxit nào có tất cả các oxit đều tác dụng được với nước.</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. SO<sub>3</sub>, CaO, CuO, Fe<sub>2</sub>O<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:red">&nbsp;&nbsp;B. SO<sub>3</sub>, Na<sub>2</sub>O, CaO, P<sub>2</sub>O<sub>5</sub></span></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">C. ZnO, CO<sub>2</sub>, SiO<sub>2</sub>, PbO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. SO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, HgO, K<sub>2</sub>O</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 7:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Dãy chỉ gồm các oxit axit là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"><span style="color:red">A. CO, CÔ<sub>2</sub>, MnO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, P<sub>2</sub>O<sub>5</sub>&nbsp; </span></span></span><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B. CO<sub>2</sub>, SO<sub>2</sub>, MnO, Al<sub>2</sub>O<sub>3</sub>, P<sub>2</sub>O<sub>5</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">C. FeO, Mn<sub>2</sub>O<sub>7</sub>, SiO<sub>2</sub>, CaO, Fe<sub>2</sub>O<sub>3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </sub>&nbsp;&nbsp;&nbsp;D. Na<sub>2</sub>O, BaO, H<sub>2</sub>O, H<sub>2</sub>O<sub>2</sub>, ZnO</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 8:</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"> Một loại đồng oxit có thành phần gồm 8 phần khối lượng đồng và1 phần&nbsp; khối lượng oxi. Công thức của oxít đó là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. CuO&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B. Cu<sub>2</sub>O&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. Cu<sub>2</sub>O<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. CuO<sub>3</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 9:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Oxit nào là oxit axit trong số các oxit kim loại cho dưới đây?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. Na<sub>2</sub>O&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. CaO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. Cr<sub>2</sub>O<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. CrO<sub>3</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 10:</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"> Oxit kim loại nào dưới đây là oxit axit?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. MnO<sub>2</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Cu<sub>2</sub>O&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. CuO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Mn<sub>2</sub>O<sub>7</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 11:</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"> Oxit phi kim&nbsp; nào dưới đây <b><i><u>không</u></i></b> phải là oxit axit?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. CO<sub>2</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B.CO<sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.SiO<sub>2</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Cl<sub>2</sub>O</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 12: </span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Oxit phi kim&nbsp; nào dưới đây <b><i><u>không</u></i></b> phải là oxit axit?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. SO<sub>2</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B.SO<sub>3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.NO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. N<sub>2</sub>O<sub>5</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 13:</span></span></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"> Oxit phi kim&nbsp; nào dưới đây <b><i><u>không</u></i></b> phải là oxit axit?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; A.N<sub>2</sub>O&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B.NO<sub>3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.P<sub>2</sub>O<sub>5</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. N<sub>2</sub>O<sub>5</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 14:</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"> Phần trăm về khối lượng của oxi cao nhất trong oxi nào cho dưới đây?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; A. CuO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. ZnO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C.PbO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. MgO</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 15:</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"> Oxit nào dưới đây góp nhiều phần nhất vào sự hình thành mưa axit?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. CO<sub>2</sub>( cacbon đioxit)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. CO( cacbon oxit)</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. SO<sub>­2</sub> ( lưu huỳnh đoxit)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. SnO<sub>2</sub>( thiếc đioxit)</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 16:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Khi thổi không khí vào nước nguyên chất, dung dịch thu được hơI có tính axit. khí nào sau đây gây nên tính axit đó?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Cacbon đioxit&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B. Hiđro&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. Nitơ&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Oxi</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 17:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Thiếc có thể có hoá trị II hoặc IV. Hợp chất có công thức SnO<sub>2</sub> có tên là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Thiếc penta oxit&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Thiếc oxit&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">&nbsp;C. Thiếc (II) oxit&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D. Thiếc (IV) oxit</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 18:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Trong phòng thí nghiệm người ta điều chế oxi bằng cách nhiệt phân KClO<sub>3</sub> hay KMnO<sub>4</sub> hoặc KNO<sub>3</sub>. Vì lí do nào sau đây?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Dễ kiếm, rẻ tiền&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Giàu oxi và dễ phân huỷ ra oxit</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Phù hợp với thiết bị hiện đại&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Không độc hại</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 19:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Người ta thu khí oxi qua nước là do:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Khí oxi nhẹ hơn nước&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Khí oxi tan nhiều trong nước</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Khí O<sub>2</sub> tan ít trong nước&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Khí oxi khó hoá lỏng</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 20: </span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%">&nbsp;Chọn định nghĩa chất xúc tác đúng và đầy đủ nhất trong số các định nghĩa sau:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A.Chất xúc tác là chất làm cho phản ứng hoá học xảy ra nhanh hơn.</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">B. Chất xúc tác là chất làm cho phản ứng hoá học xảy ra nhanh hơn nhưng không tham gia vào phản ứng</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Chất xúc tác là chất làm cho phản ứng hoá học xảy ra nhanh hơn và tiêu hao trong phản ứng</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">D. Chất xúc tác là chất làm cho phản ứng hoá học xảy ra nhanh hơn nhưng không bị tiêu hao trong phản ứng.</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 21:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Trong phòng thí nghiệm cần điều chế 4, 48lít O<sub>2</sub> (đktc)</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dùng chất nào sau đây để có khối lượng nhỏ nhất :</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. KClO<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. KMnO<sub>4</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. KNO­<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. H<sub>2</sub>O( điện phân)</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">&nbsp;<b><u>Câu 22:</u></b> Nguyên liệu để sản xuất khí O<sub>2</sub> trong công nghiệp là phương án nào sau đây:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. KMnO<sub>4</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. KClO<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. KNO<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;D. Không khí</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 23:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Chọn định nghĩa phản ứng phân huỷ đầy đủ nhất:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Phản ứng phân huỷ là phản ứng hoá học trong đó một chất sinh ra một chất mới</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">B. Phản ứng phân huỷ là phản ứng hoá học trong đó một chất sinh ra hai chất mới</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Phản ứng phân huỷ là phản ứng hoá học trong đó một chất sinh ra hai hay nhiều&nbsp; chất mới</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">D. Phản ứng phân huỷ là phản ứng hoá học có chất khí thoát ra</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 24:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Câu nào đúng khi nói về không khí trong các câu sau?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Không khí là một nguyên tố hoá học</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">B. Không khí là một đơn chất</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Không khí là một hỗn hợp chất của 2 nguyên tố là oxi và nitơ</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">D. Không khí là hỗn hợp của 2 khí là oxi và nitơ</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 25:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Trong 16g CuSO<sub>4</sub> có chứa bao nhiêu gam đồng?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. 6,4g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B.6,3g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. 6,2g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D.6,1g</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 26:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Trong hợp chất CuSO<sub>4</sub> phần trăm khối lượng của Cu, S, O lần lượt là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. 30%; 20%; 50%&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. 40%; 20%; 40%</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. 25%; 50%; 25%&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. 30%; 40%; 30%</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 27:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Phần trăm khối lượng của Cu trong CuO là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. 40%&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. 60%&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. 70%&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. 80%</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 28:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%">Hợp chất Y có 74,2% natri về khối lượng, còn lại là Oxi. Phân tử khối của Y là 62 g đvC. Số nguyên tử Na và O trong một phẳnt chất Y lần lượt là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. 1 và 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. 2 và 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;C. 1 và 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. không xác định</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 29:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%">Trong x gam quặng sắt hematit có chứa 5,6g Fe. Khối lượng Fe<sub>2</sub>O<sub>3</sub> có trong quặng đó là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. 6g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. 7g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. 8g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D.9g</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 30:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Trong oxit, kim loại có hoá trị III và chiếm 70% về khối lượng là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. Cr<sub>2</sub>O<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Al<sub>2</sub>O<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. As<sub>2</sub>O<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Fe<sub>2</sub>O<sub>3</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">&nbsp;<b><u>Câu 31:</u></b> Oxit nào sau đây có phần trăm khói lượng oxi nhỏ nhất?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">( cho Cr= 52; Al=27; As= 75; Fe=56)</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. Cr<sub>2</sub>O<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Al<sub>2</sub>O<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. As<sub>2</sub>O<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Fe<sub>2</sub>O<sub>3</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 32:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Nếu đốt cháy hoàn toàn 2,40g cacbon trong 4,80g oxi thì thu được tối đa bao nhiêu gam khí CO<sub>2</sub>?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. 6,6g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B.6,5g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C.6,4g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. 6,3g</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 33:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Một oxit trong đó cứ 12 phần khối lượng lưu huỳnh thì có 18 phần khối lượng oxi. Công thức hoá học của của oxit là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. SO<sub>2</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. SO<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. S<sub>2</sub>O&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. S<sub>2</sub>O<sub>3</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 34</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%">: Một loại oxit sắt trong đó cứ 14 phần sắt thì có 6 phần oxi( về khối lượng). Công thức của oxit sắt là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. FeO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Fe<sub>­2</sub>O<sub>­3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. Fe<sub>3</sub>O<sub>4</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Không xác định</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 35</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">: Một loại đồng oxit có tỉ lệ khối lượng giữa Cu và O là 8:1. Công thức hoá học của oxit này là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. CuO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Cu<sub>2</sub>O&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. CuO<sub>2</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Cu<sub>2</sub>O<sub>2</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 36</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">: Đốt chấy 3,2g lưu huỳnh&nbsp; trong một bình chứa 1,12 lít khí O<sub>2</sub>( đktc). Thể tích khi SO<sub>2</sub> thu được là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. 4,48lít&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. 2,24 lít&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. 1,12 lít&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. 3,36 lít</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 37:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Cho các chất sau:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">1. FeO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2. KClO<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3. KMnO<sub>4</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">4. CaCO­<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5. Không khí&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 6. H<sub>2</sub>O</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">Những chất được dùng để điều chế oxi trong phòng thí nghiệm là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. 1, 2, 3, 5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. 2, 3, 5, 6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. 2, 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. 2, 3, 5</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 38:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Người ta thu khí oxi bằng cách đẩy nước là nhờ dựa vào tính chất:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Khí oxi tan trong nước&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Khí oxi ít tan trong nước</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Khí oxi khó hoá lỏng&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Khí oxi nhẹ hơn nước</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 39:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Người ta thu khí oxi bằng cách đẩy không khí&nbsp; là nhờ dựa vào tính chất:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Khí oxi nhẹ hơn không khí&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Khí oxi nặng&nbsp; hơn không khí&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Khí oxi dễ trộn lẫn với không khí&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Khí oxi ít tan trong nước</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 40:</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"> Sự oxi hoá chậm là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A.Sự oxi hoá mà không toả nhiệt&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Sự oxi hoá mà không phát sáng</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Sự oxi hoá toả nhiệt mà không phát sáng&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Sự tự bốc cháy</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 41:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Khi phân huỷ có xúc tác 122,5g KClO<sub>3</sub>, thể tích khí oxi thu được là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. 33,6 lít&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. 3,36 lít&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. 11,2 lít&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D.1,12 lít</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 42:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Số gam KMnO<sub>­4</sub> cần dùng để đièu chế được 2,24 lít&nbsp; khí oxi (đktc) là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. 20,7g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. 42,8g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. 14,3g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. 31,6g</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 43:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%">Có 3 oxit sau: MgO, SO<sub>3</sub>, Na<sub>2</sub>O. Có thể nhận biết được các chất đó bằng thuốc thử sua đây?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">A. Chỉ dùng nước&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Chỉ dùng dung dịch kiềm</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Chỉ dùng axit&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Dùng nước và giấy quì</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 44:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Tỉ lệ khối lượng của nitơ và oxi trong một oxit là 7:20. </span></span><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Công thức của oxit là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. N<sub>2</sub>O&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. N<sub>2</sub>O<sub>3</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. NO<sub>2</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D, N<sub>2</sub>O<sub>5</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 45:</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"> Cho 6,5g Zn vào bình đựng nước dung dịch chứa 0,25 mol HCl. Thể tích khí H<sub>2</sub> (đktc) thu được là:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. 2lít&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. 2,24 lít&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. 2,2 lít&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. 4lít</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 46:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%">Cho các oxit có công thức hoá học sau:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">CO<sub>2</sub>, CO, Mn<sub>2</sub>O<sub>7</sub>, SiO<sub>2</sub> MnO<sub>2</sub>, P<sub>2</sub>O<sub>5</sub>, NO<sub>2</sub>, N<sub>2</sub>O<sub>5</sub>, CaO, Al<sub>2</sub>O<sub>3</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">Các oxit axit được sắp xếp như sau:</span></span></span></span></span><br />
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	<ol>
		<li style="list-style-type:none">
		<ol style="list-style-type:upper-alpha">
			<li style="margin-left:60px"><span style="font-size:12pt"><span style="line-height:150%"><span style="tab-stops:list 135.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">CO, CO<sub>2</sub>, Mn<sub>2</sub>O<sub>7</sub>, Al<sub>2</sub>O<sub>3</sub>, P<sub>2</sub>O<sub>5</sub></span></span></span></span></span></span></li>
			<li style="margin-left:60px"><span style="font-size:12pt"><span style="line-height:150%"><span style="tab-stops:list 135.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">CO<sub>2</sub>, Mn<sub>2</sub>O<sub>7</sub>, SiO<sub>2</sub>, P<sub>2</sub>o<sub>5</sub>, NO<sub>2</sub>, N<sub>2</sub>O<sub>5</sub></span></span></span></span></span></span></li>
			<li style="margin-left:60px"><span style="font-size:12pt"><span style="line-height:150%"><span style="tab-stops:list 135.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">CO<sub>2</sub>, Mn<sub>2</sub>O<sub>7</sub>, SiO<sub>2</sub>, NO<sub>2</sub>, MnO<sub>2</sub>, CaO</span></span></span></span></span></span></li>
			<li style="margin-left:60px"><span style="font-size:12pt"><span style="line-height:150%"><span style="tab-stops:list 135.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">SiO<sub>2</sub>, Mn<sub>2</sub>O<sub>7</sub>, P<sub>2</sub>O<sub>5</sub>, N<sub>2</sub>O<sub>5</sub>, CaO</span></span></span></span></span></span></li>
		</ol>
		</li>
	</ol>
	</li>
</ol>
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 47</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%">:Phản ứng nào dưới đây là phản ứng hoá hợp</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. CuO + H<sub>2</sub>&nbsp; -&gt; Cu + H<sub>2</sub>O&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">&nbsp;B. CaO +H<sub>2</sub>O -&gt; Ca(OH)<sub>2</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">&nbsp;C. 2MnO<sub>4 </sub>&nbsp;-&gt; K<sub>2</sub>MnO<sub>4</sub> + MnO<sub>2</sub> + O<sub>2</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">&nbsp;D. CO<sub>2</sub> + Ca(OH)<sub>2</sub>-&gt; CaCO<sub>3</sub> +H<sub>2</sub>O</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 48:</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"> Phản ứng nào dưới đây <b><i><u>không phải</u></i></b> là phản ứng hoá hợp:</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. 3Fe + 3O<sub>2</sub>&nbsp; -&gt; Fe<sub>3</sub>O<sub>4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B. 3S +2O<sub>2</sub> - &gt; 2SO<sub>2</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">C. CuO +H<sub>2</sub> -&gt; Cu + H<sub>2</sub>O&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. 2P + 2O<sub>2</sub> - &gt; P<sub>2</sub>O<sub>5</sub></span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">Câu 49:</span></span></u></b><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%"> Có 4 lọ đựng riệng biệt: nước cất, dung dịch H<sub>2</sub>SO<sub>4</sub>, dung dịch NaOH, dung dịch NaCl. Bằng cách nào có thể nhận biết được mỗi chất trong các lọ?</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="IT" style="font-size:14.0pt"><span style="line-height:150%">A. Giấy quì tím&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. Giấy quì tím và đun cạn</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">C. Nhiệt phân và phenolphtalein&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. Dung dịch NaOH</span></span></span></span></span><br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:14.0pt"><span style="line-height:150%">Câu 50:</span></span></u></b><span style="font-size:14.0pt"><span style="line-height:150%"> Có 4 lọ mất nhãn đựng 4 chất bột màu trắng gồm: CaO, Na<sub>2</sub>O, MgO và P<sub>2</sub>O<sub>5</sub>. Dùng thuốc thử nào để nhận biết các chất trên?</span></span></span></span></span><br />
&nbsp;
<ol style="list-style-type:upper-alpha">
	<li style="margin-left:32px"><span style="font-size:12pt"><span style="line-height:150%"><span style="tab-stops:list .75in"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">Dùng nước và dung dịch H<sub>2­</sub>SO<sub>4</sub></span></span></span></span></span></span></li>
	<li style="margin-left:32px"><span style="font-size:12pt"><span style="line-height:150%"><span style="tab-stops:list .75in"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">Dùng dung dịch H­<sub>2</sub>SO<sub>4</sub> và phenolphtalein</span></span></span></span></span></span></li>
	<li style="margin-left:32px"><span style="font-size:12pt"><span style="line-height:150%"><span style="tab-stops:list .75in"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">Đung nước và giấy quì tím</span></span></span></span></span></span></li>
	<li style="margin-left:32px"><span style="font-size:12pt"><span style="line-height:150%"><span style="tab-stops:list .75in"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">Không có chất nào thử được</span></span></span></span></span></span></li>
</ol>
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span style="font-size:16.0pt"><span style="line-height:150%">ĐÁP ÁN:</span></span></u></b></span></span></span><br />
<br />
<span style="font-size:12pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:150%">1.C; 2.A; 3.B; 4.D; 5.C; 6.B; 7.B; 8.B; 9.D; 10.B; 11.B; 12.C; 13.A; 14.D; 15.C; 16.A; 17.D; 18.B; 19.C; 20.D; 21.D; 22.D; 23.C; 24.D; 25.A; 26.B; 27.D; 28.B; 29.D; 30.D; 31.C; 32.A; 33.B; 34.B; 35.B; 36.C; 37.C; 38.B; 39.B; 40.C; 41.A; 42.D;43.D; 44.B; 45.A; 46.B; 47.B; 48.C; 49.B; 50.C</span></span></span></span></span><br />
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				<strong>Nguồn tin:</strong>
				Giáo viên: Nguyễn Thị Mơ
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