1.không nên dùng phương pháp đẩy nước để thu khí nào sau đây a) O2 b)H2 c) SO3 d)CO2 2.Chất nào sau đây khi hòa tan vào dung dịch HCl thu được dung dịch màu xanh lam a) Cuo b)Na2O c)Fe2O3 d)SiO2 3. Cho các oxit : Al2O3(1),N2O(2),CaO(3),SO2(4). Hàm lượng oxi trong các oxit được xếp theo chiều tăng dần từ thấp đến cao là a)(1),(3),(2),(4) b)(4),(1),(2),(3) c)(3),(2),(1),(4) d)(2),(4),(1),(3) 4. Một oxit bazo có chứa 80% kim loại. Oxit đó là a)Cr2O3 b)ZnO c)Li2O d)CuO 5. Khí CO dùng làm chất đốt trong công nghiệp, có lẫn tạp chất SO2 và CO2. Hóa chất rẻ tiền nhất dùng để loại bỏ hoàn toàn tạp chất trên là a)H2O dư b) dung dịch NaOH c) dung dịch Ca(OH)2 d) dung dịch NaCL 6.Bột Cao có thể loại bỏ hơi nước lẫn trong các khí nào sau đây a)H2,O2,Cl2,SO2,C2H4 b)N2,CO,NH3,C2H2,O2 c)Cl2,CO2,HCl,H2S,SO2 d)H2,CO,CO2,NH3,CH4

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