Which of the following reaction will take place
(1) Sn+FeSO4
(2) Cu+FeSO4
(3) Au+FeSO4
(4) Mg+ZnSO4
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Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s) [ ✔️ ]
This reaction will take place as Zn is more reactive than copper and hence will displace Cu from CuSO4.
Fe(s) + ZnSO4(aq) → FeSO4(aq) + Zn(s) [ × ]
For this reaction, Fe is less reactive than Zn. Hence, the reaction will not take place as Fe can't displace Zn from ZnSO4 according to the reactivity series of elements.
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