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tranthikhanhhuyen26032004
2 năm trước
Câu 17. Dãy oxit tác dụng với dung dịch H2SO4 loãng là: A. MgO, Fe2O3, SO2, CuO. B. Fe2O3, MgO, P2O5, K2O. C. MgO, Fe2O3, CuO, K2O. D. MgO, Fe2O3, SO2, P2O5. Câu 18. Để làm khô một mẫu khí SO2 ẩm có (lẫn hơi nước) ta dẫn mẫu khí này qua A. NaOH đặc. B. Nước vôi trong dư. C. H2SO4 đặc. D. Dung dịch HCl. Câu 19. Dãy các chất không tác dụng được với dung dịch H2SO4 loãng là: A. Zn, ZnO, Zn(OH)2. B. Cu, CuO, Cu(OH)2. C. Na2O, NaOH, Na2CO3. D. MgO, MgCO3, Mg(OH)2. Câu 20. Nhóm chất tác dụng với dung dịch H2SO4 loãng sinh ra chất kết tủa màu trắng: A. ZnO, BaCl2. B. CuO, BaCl2. C. BaCl2, Ba(NO3)2. D. Ba(OH)2, ZnO. Câu 21. Cho một mẫu giấy quỳ tím vào dung dịch NaOH. Thêm từ từ dung dịch HCl vào cho đến dư ta thấy màu giấy quì: A. Màu đỏ không thay đổi B. Màu đỏ chuyển dần sang xanh. C. Màu xanh không thay đổi D. Màu xanh chuyển dần sang đỏ. Câu 22. Trung hòa 200ml dd NaOH 2M cần bao nhiêu ml dd dd H2SO4 0,8M? A. 125ml B. 200ml. C. 250ml. D. 500ml.
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