Balance the following redox reactions using the oxidation number and ion-electron method:
$(1) \ Zn + NO_3^- + H^+ \to Zn^{2+} + N_2O + H_2O$
$(2) \ I^- + O_2 + H_2O \to I_2 + OH^-$
$(3) \ MnO_4^- + C_2H_5OH \to Mn^{2+} + CH_3COOH$
$(1) \ Zn + NO_3^- + H^+ \to Zn^{2+} + N_2O + H_2O$
$(2) \ I^- + O_2 + H_2O \to I_2 + OH^-$
$(3) \ MnO_4^- + C_2H_5OH \to Mn^{2+} + CH_3COOH$
(N/A) $(1) \ 4Zn + 2NO_3^- + 10H^+ \to 4Zn^{2+} + N_2O + 5H_2O$
$(2) \ 4I^- + O_2 + 2H_2O \to 2I_2 + 4OH^-$
$(3) \ 4MnO_4^- + 5C_2H_5OH + 12H^+ \to 4Mn^{2+} + 5CH_3COOH + 11H_2O$
$(2) \ 4I^- + O_2 + 2H_2O \to 2I_2 + 4OH^-$
$(3) \ 4MnO_4^- + 5C_2H_5OH + 12H^+ \to 4Mn^{2+} + 5CH_3COOH + 11H_2O$
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