Question

Zinc sulfate forms a colorless solution in water. The colour obtained when copper is added is?

Answer 1

Reactivity of copper and zinc

• Copper$\left(\mathrm{Cu}\right)$ has a lower reactivity than zinc$\left(\mathrm{Zn}\right)$.
• As a result, copper does not replace zinc in a zinc sulfate$\left({\mathrm{ZnSO}}_4\right)$ solution.
• As a result, the displacement reaction does not occur.
• $$\begin{gathered} {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}\left(\mathrm{s}\right)\to \mathrm{No}\mathrm{reaction} \\ \mathrm{colourless} \end{gathered}$$

Hence, there is no change in the color of Zinc sulfate when copper is added to it.