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Question

State which of the following chemical reactions will take place or not, giving suitable reason for each:
(a)Zn(s)+CuSo4(aq)ZnSO4(aq)+Cu(s)
(b)Fe(s)+ZnSO4(aq)FeSO4(aq)+Zn(s)
(c)Zn(s)+FeSO4(aq)ZnSO4(aq)+Fe(s)

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Solution

Zn(s)+CuSO4(aq)ZnSO4(aq)+Cu(s) and Zn(s)+FeSO4(aq)ZnSO4(aq)+Fe(s) is possible as Zn is more reactive than Cu and Fe respectively and hence can replace them from their respective salt solutions. Whereas Fe(s)+ZnSO4(aq)FeSO4(aq)+Zn(s) will not happen as Fe is less reactive than Zn.

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