a) III II I VI II III VI II I II
Fe2O3+3H2SO4--->Fe2(SO4)3+3H2O
b) II II I V II II V II I II
MgO+2HNO3--->Mg(NO3)2+H2O
c) I II I V II I V II I II
3Cu2O+2H3PO4--->2Cu3PO4+3H2O
d) I II I II I II I II
Na2O+H2S--->Na2S+H2O
e) II II I IV II II IV II I II
CuO+H2CO3--->CuCO3+H2O
f) II II I I II I I II
MgO+2HCl--->MgCl2+H2O
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a) III II I VI II III VI II I II
Fe2O3+3H2SO4--->Fe2(SO4)3+3H2O
b) II II I V II II V II I II
MgO+2HNO3--->Mg(NO3)2+H2O
c) I II I V II I V II I II
3Cu2O+2H3PO4--->2Cu3PO4+3H2O
d) I II I II I II I II
Na2O+H2S--->Na2S+H2O
e) II II I IV II II IV II I II
CuO+H2CO3--->CuCO3+H2O
f) II II I I II I I II
MgO+2HCl--->MgCl2+H2O