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Thanhmaido
2 năm trước
Câu 8: Cho các phát biểu sau: a. Nhỏ dd HCl vào CaCO3 có khí thoát ra. b. Nhỏ dd H2SO4 vào dd Cu(NO3)2 có kết tủa tạo thành. c. Trong công nghiệp, điều chế SO2 bằng cách hòa tan CaSO3 vào dd HCl. d. Dùng dd BaCl2 phân biệt được dung dịch H2SO4 và dung dịch HCl. e. Dùng CaO khử chua đất trồng trọt.Số phát biểu đúng là: *
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