A metal rod $(M)$ was dipped in a coloured solution $(Y)$. After some time it was observed that the

Question

A metal rod $(M)$ was dipped in a coloured solution $(Y)$. After some time it was observed that the metal rod starts dissolving in the solution and the solution starts fading in colour. However, a coloured precipitate $(Z)$ was seen at the bottom of the beaker. $(M),(Y)$ and $(Z)$ could be

Professor PC Thomas Classes · Answer

(a) : Zn lies above Fe in the reactivity series, hence it is more reactive than Fe and displaces Fe from $\mathrm{FeSO}_4$ solution. \ $ \underset{(M)}{\mathrm{Zn}_{(s)}}+\underset{(Y)}{\mathrm{FeSO}_{4(a q)}} \longrightarrow \mathrm{ZnSO}_{4(a q)}+\underset{(Z)}{\mathrm{Fe}_{(s)}} $