iron nail was dipped into a salt solution . after sometime a reddish- brown deposition was seen .what could be the salt solution

The salt solution should be copper sulphate (CuSO4). Iron displaces copper from its salt solution as a result of which a reddish-brown layer of Cu is deposited on iron nail. The reaction is as follows:
Fe(s) + CuSO4(aq) FeSO4(aq) +Cu(s)

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The above stated reaction can be -

Fe + CuSO4→FeSO4 + Cu

Cu is the reddish-brown deposition on the iron nail.

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