Question

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

Answer 1

Answer:

it is due to displacement reaction the green colour fades away

Answer 2

Answer:

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

Explanation:

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