Câu 1: Oxit nào sau đây khi tác dụng với nước tạo thành bazơ tương ứng? A. Fe2O B. CaO C. SO3 D. P2O5 Câu 2: Oxit của một nguyên tố có hóa trị II chứa 20% oxi (về khối lượng). Nguyên tố đó là: A. đồng B. nhôm C. canxi D. magie Câu 3: Trong dãy chất sau đây, dãy chất nào toàn là oxit? A. H2O, MgO, SO2, FeSO4 B. CO2, SO2, N2O5, P2O5 C. CO2, K2O, Ca(OH)2, NO D. CaO, SO2, Na2CO3, H2SO4 Câu 4: Cho 6,5 gam kẽm vào dung dịch HCl thì thể tích khí H2 thoát ra (đktc) là: A. 2 lít B. 4,48 lít C. 2,24 lít D. 4 lít Câu 5: Trường hợp nào sau đây chứa khối lượng nguyên tử hiđro ít nhất? A. 6.1023 phân tử H2 B. 3.1023 phân tử H2O C. 0,6g CH4 D. 1,50g NH4Cl Câu 6: Khử 12g sắt(III) oxit bằng khí hiđro. Thể tích khí hiđro cần dùng (đktc) là A. 5,04 lít B. 7,36 lít C. 10,08 lít D. 8,2 lít Câu 7: Hãy định nghĩa: axit, bazơ, muối và cho ví dụ minh họa.

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