Why does iron nail become brownish in color when immersed in copper sulphate solution and and the blue color of the solution fade?

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Solution

Iron Nail is Fe and blue copper sulphate is CuSO4. When nail is kept in it, Fe being more reactive than copper, it displaces copper from Copper sulphate and forms Ferrous Sulphate which is greenish blue, and the copper displaces deposits around nails giving it colour of reddish brown.

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