Make up redox reactions: H2S + O2 = H2O + SO2; NH3 + O2 = NO + H2O; CuO + H2 = Cu + H2O; Zn + HCl = ZnCl2 + H2.

4H2S + 602 = 4H2O + 4SO2
S-Reducing agent
O-Oxidant,
4NH3 + 502 = 4NO + 6H2O
0-oxidant
N-reducing agent
CuO + H2 = Cu + H20- does not require equalization,
Zno + 2HCL = ZnCL + h20



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