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Why does the colour of copper sulphate (CuSO4) solution change, when an iron nail is dipped into it ? Write chemical equation also.

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Why does the colour of copper sulphate (CuSO4) solution change, when an iron nail is dipped into it ? Write chemical equation also.

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Iron nail dipped here iron displaces copper from copper sulphate solution in Copper sulphate solution changes the colour of Copper sulphate solution from blue to green due to the formation of Iron sulphate.

Chemical Equation:

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