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ĐÂY LÀ TRẮC NGHIỆM CHỈ CẦN KHOANH ĐÁP ÁN THUI câu 1: PUHH có thể xảy ra sự oxi hóa là A) 4NH3 + 5O2--->4NO+6H2O B) Na2O+H2O---> 2NaOH C) CaCO3------> CaO+CO2 D) Na2SO4+BaCl2---->BaSO4+2NaCl Câu 2 Nhóm công thức nào sau đây biểu dienx toàn oxit: A) CuO;CaCO3;SO3 B) N2O5;Al2O3;SiO2 C) FeO;KCl;P2O5 D) CO2;H2SO4;MgO CÂU 3: phản ứng nào là phản ứng hóa hợp? A) CuO+H2---->Cu+H2O B) CO2+Ca(OH)2---->CaCO3+H2O C) 2KMnO4----> K2MnO4+MnO2+O2 D) CaO+H2O---->Ca(OH)2 mong mn giúp đỡ
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