Question

Give reason why:

Colour of the solution changes when iron nail is dipped in copper sulphate solution.

Answer 1

Iron nails when left dipped in blue copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.

Fe + CuSO₄→ FeSO₄ + Cu

The above reaction is a type of displacement reaction in which one element displaces another element from its compound and takes its place therein. In the reaction, Fe replaces Cu and form a new compound.