Answer:
A more reactive metal always replaces a less reactive metal from its salt solution. (a)\[FeS{{O}_{4}}+Cu\to CuS{{O}_{4}}+Fe\to Not\,possible\] (b) \[2KI+K\to 2KCl+{{I}_{2}}\to Not\,possible\] (c)\[N{{a}_{2}}S{{O}_{4}}+K\to {{K}_{2}}S{{O}_{4}}+2Na\to Possible\] (d) \[ZnS{{O}_{4}}+Fe\to FeS{{O}_{4}}+Zn\to Possible\]
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