Question

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?​

Answer 1

When an iron nail is dipped in copper sulphate solution, then the colour of copper sulphate solution changes because iron displaces copper from copper sulphate solution to form light green solution of iron sulphate. This reaction is known as displacement reaction.This displacement occurs because iron is more reactive than copper.

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Answer 2

Explanation:

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HERE IS YOUR ANSWER:

The colour changes due to Displacement reaction . As iron is more reactive than copper , it displaces it from its solution changing the colour from blue to colorless.

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