12. Specify the types of redox reactions:
a) KClO3 → KClO4 KCl;
b) HgO → HgO2;
c) (NH4)2Cr2O7 → N2 Cr2O3 H2O.

Based on the electronic equations, arrange the coefficients in the equations of the reactions that follow the schemes:
KCrO2 Cl2 KOH → K2CrO4 KCl H2O
NiS H2O2 H2SO4 → NiSO4 S H2O
H2SO4 Zn → ZnSO4 S H2O

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