Составьте электронный баланс для уравнений :

1)NaOH+HNO2=NaNO2+H2O

2)K2CO3+HNO2=KNO2+HCO3

3)K2CO3+HNO3=KNO3+H2CO3

4)K2CO3+H3PO4=KPO4+H3CO3
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