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Giải thích nữa nha 5. Dãy nào sau đây gồm các chất đều là oxit A. Al2O3, CaO, MgO B. CaO, MnO2, BaSO4 C. FeO, CaCO2, Na2O D. MgO, NaOH, Al2O3 6. Điều khẳng định nào sau đây là đúng? A. Đốt cháy hoàn toàn 0,1 mol hidro trong khí oxi vừa đủ thấy 0,1 mol nước tạo thành B. Khi đốt cháy hoàn toàn 0,1 mol khí hidro cần 0,5 mol khí oxi C. Khi đốt cháy khí hidro trong khí oxi, cứ 1 mol khí hidro tác dụng vừa hết với 1 mol khí oxi D. Đốt cháy hoàn toàn 1 mol khí hidro trong khí oxi vừa đủ thấy có 0,5 mol nước tạo thành 7. Cho 2,24 lít khí H2 (đktc) tác dụng vừa đủ với CuO (đun nóng). Khối lượng Cu tạo thành sau phản ứng là A. 3,2 g B. 6,4 g C. 1,6 g D. 4,8 g
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