What happens when liquid Mercury is poured into a beaker containing aqueous solution of Copper (II) sulphate pentahydrate ?

1. When liquid Mercury is poured into a beaker containing aqueous solution of Copper (II) sulphate pentahydrate, no reaction will takes place.
2. This is because liquid Mercury ($\mathrm{Hg}$) is less reactive than Copper($\mathrm{Cu}$) so, it cannot displace Copper from its solution.
3. : $$\begin{gathered} \mathrm{Hg}\left(\mathrm{l}\right)+{\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}\left(\mathrm{aq}\right)\to \mathrm{No}\mathrm{reaction}. \\ \left(\mathrm{Mercury}\right)(\mathrm{Copper}(\mathrm{II})\mathrm{sulphate}\mathrm{pentahydrate}) \end{gathered}$$

Therefore, when liquid Mercury is poured into a beaker containing aqueous solution of Copper (II) sulphate pentahydrate, no reaction will takes place.