Consider the following reactions :
$CuS O_{4} + Fe \to FeS O_{4} + Cu$
$FeS O_{4} + Zn \to ZnS O_{4} + Fe$
Which one of the following statements is correct?

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Cu is more reactive and Zn is less reactive.

Zn is most reactive and Cu is less reactive.

Zn is least reactive and Fe is more reactive.

Fe is less reactive and Zn is more reactive.

answer is B.

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Detailed Solution

Metals that can displace other metals from their solution are comparatively more reactive than the metal present in the solution.

For the first reaction, Fe is more reactive than Cu, so displacement occurs and the product is $FeS O_{4}$ .
$CuS O_{4} + Fe \to FeS O_{4} + Cu$

For the second reaction, Zn is more reactive than Fe, so the end of the displacement reaction product is $FeS O_{4}$ . Zinc displaces iron from $FeS O_{4}$ and iron displaces copper from $CuS O_{4}$ .

$FeS O_{4} + Zn \to ZnS O_{4} + Fe$

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