Question

Iron nail when left dipped in blue copper sulphate solution becomes brownish in colour and blue colour of copper sulphate solutions turn to light green

Answer 1

This is because iron displaces copper in this reaction as it is more reactive and forms a brown deposition on the nail(copper) and forms FeSO4 which os green in colour

Answer 2

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed in the surface of iron and the colour of copper sulphate solution changes from blue to pale green. The reaction shows that iron is more reactive than copper because it displaces copper from the copper sulphate solution.