Identify the oxidising and reducing agent in the following reactions.
(a) Fe2 O3 + 3CO -------> 2Fe + 3 CO2
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(b) Pb3O4 + 8HCl --------> 3PbCl2 + Cl2 + 4H2 O
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(c ) CuSO4 + Zn ----------> Cu + ZnSO4
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(d) 2 H2S + SO2 -----------> 3S + 2H2O
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