A strip of metal X is dipped in a blue-coloured salt solution ${YSO}_{4}$ . After some time, a layer of metal Y from the salt solution is formed on the surface of metal strip X. Metal X is used in galvanisation whereas metal Y is used in making electric wires. Metal X and metal Y together form an alloy Z. Which of the following is the metal salt ${YSO}_{4}$ ?

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CuSO4

ZnSO4

MgSO4

FeSO4

answer is A.

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Detailed Solution

The metal salt is CuSO4.
When a strip of zinc is dipped in the blue-coloured salt solution of copper sulphate (CuSO4), the copper from copper sulphate is displaced by zinc metal as zinc is more reactive than copper and is placed higher in the reactivity series. The reaction is as follows:
Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). Zinc is less reactive than iron, and hence its salts cannot be used.

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