Question

On keeping iron nails in blue coloured copper sulphate solution, it is observed that the colour

Answer 1

It is observed that blue colour of copper sulphate starts fading away because iron extracts the copper present in the solution due to which the blue colour is imparted to it. It happens so because iron is more reactive than copper as it lies above copper in the reactivity series.
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Answer 2

The ferrous sulphate crystals are light green in colour. The gas emitted has the characteristic odour of burning sulphur. On heating, the colour changes from light green to white. On further heating, the white substance changes to d