Make the material and electronic balance of the following oxidation-reduction reactions:
H2SO4 Mg→MgSO4 S H2O
HNO3 (diff.) Ag→AgNO3 NO H2O
HNO3 Zn→Zn(NO3)2 NH4NO3 H2O
HNO3 Al→Al(NO3) NH4NO3 H2O
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