Question

A charateristic change of colour is seen when a piece of iron is added to copper II sulphate solution . Give reasons.

Answer 1

The change in the colour is due to the formation of ferrous sulphate of brown colour.l
CuSO4 + Fe -> FeSO4 + Cu displacement reaction

Answer 2

When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

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