А - 5
Zn + H2SO4 -> ZnSO4 + H2
Zn + 2KOH -> K2ZnO2 + H2
2Zn + O2 -> 2ZnO
Б -3
Fe2O3 + 3C ->2 Fe + 3CO
Fe2O3 + 2Al -> Al2O3 + 2Fe
Fe2O3 + 6HNO3 -> 2Fe(NO3)3 + 3H2O
В-2
Сa(OH)2 + 2HCl -> CaCl2 + 2H2O
Ca(OH)2 + CO2 -> CaCO3 + H2O
Ca(OH)2 + Na2CO3 -> CaCO3 + 2NaOH
Г -1
2СH3COOH + Mg -> (CH3COO)2Mg + H2
CH3COOH + KOH -> CH3COOK + H2O
2CH3COOH + CuO -> (CH3COO)2Cu + H2O