1.\(4Zn+5H_2SO_4\rightarrow4ZnSO_4+H_2S+4H_2O\)
\(4:Zn^o-2e\rightarrow Zn^{2+}\)
\(1:S^{6+}+8e\rightarrow S^{2-}\)
2.\(FeO+26HNO_3\rightarrow8Fe\left(NO_3\right)_3+N_2O+13H_2O\)
\(1:Fe^{2+}-e\rightarrow Fe^{3+}\)
\(1:N^{5+}+e\rightarrow N^{4+}\)