Question

1.
Why does the colour of copper sulphate solution change when
an iron nail is dipped in it?​

Answer 1

Answer:

Explanation:

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.

Answer 2

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When an iron nail dipped in the copper sulphate solution than iron displaces copper from the copper sulphate because iron is more reactive than copper. Therefore the colour of the copper sulphate solution changes.

The reaction involved here is:

Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)