Расставьте коэффициенты в реакциях методом электронного баланса:
[tex]a) KMnO_4+KNO_2+H_2SO_4=K_2SO_4+MnSO_4+KNO_3+H_2O[tex]

[/tex]b)Zn+H_2SO_4[tex](конц.)[/tex]=ZnSO_4 +SO_2 +H_2O[tex]​
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