Đáp án:
A: Fe + H2SO4(l) → FeSO4 + H2 ↑ → Phản ứng thế
B: 2Mg + O2 –to-> 2MgO → Phản ứng hóa hợp
C: 2KMnO4 –to-> K2MnO4 + MnO2 + O2 ↑ → Phản ứng phân hủy
D: Ca(OH)2 + 2HCl → CaCl2 + 2H2O → Phản ứng trao đổi
Câu A là phản ứng thế nhá..
Fe + H2SO4=>FeSO4+H2.
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tìm x ,-2 * ( -x -5 ) + 18 = 20 - 3 * ( x + 4 )
VẼ FL.ADC cho mình với KO chép mạng nha
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