11. Specify only oxidizing agents, only reducing agents and compounds that can exhibit both oxidizing and reducing properties: MnO, H2SO4, NH3, Zn, HBr, H2SO4, H2O2, NaH. Based on the electronic equations, arrange the coefficients in the equations of the reactions that follow the schemes:
Cr2(SO4)3 Cl2 KOH → K2CrO4 KCl K2SO4 H2O
Zn HNO3 → Zn(NO3)2 N2O H2O
KMnO4 H2S H2SO4 → MnSO4 S K2SO4 H2O

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