A) CaO(s)+2HCl(g)→CaCl2 (s)+H2O(g)
B) 4FeO(s)+O2(g)→2Fe2O3(s)
C) 2CuO(s)+NO(g)→Cu2O(s)+NO2(g)
D) 4NH3(g)+O 2 (g)→2N2H4(g)+2H2O(l)
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