Question

why does colour of copper sulphate solution change when an iron nail is dipped into it​

Answer 1

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➡When an "iron nail" dips into the solution of "copper sulphate" than iron, the copper sulphate displaces copper because "iron" is "more reactive" than "copper". Hence the colour of the solution for copper sulphate changes

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Answer 2

Answer:

the color of copper sulphate solution changes when an iron nail is dipped in it because iron is being more reactive than copper, displaces copper metal from aqueous copper sulphate solution. This, blue color of copper sulphate fades away to give green color solution of ferrous sulphate.