Why does colour of iron nail change from grey to reddish brown in copper sulphate solution
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When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green. ... so it wil turn reddish-brown and the colour of the solution will also change from blue to green.
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Due to oxidation .... it's black colour changes to reddish brown...
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