Why does the color of copper sulphate change when an iron nail is kept in it?

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Copper displaces iron from iron sulphate forming copper sulphate

Iron displaces copper from copper forming copper sulphate

Iron displaces copper from copper sulphate forming iron sulphate

None of the above

answer is C.

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Detailed Solution

The colour of copper sulphate solution changes when an iron nail is dipped into it because iron takes the place of copper from copper sulphate forming iron sulphate, which is greenish in appearance. Thus, The colour changes from blue to green.
Cu

{SO}_{4}

+ Fe

\to

{SO}_{4}

+ Cu
(Blue Solution) (grey) (greenish) (red-brown)

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