Which of the following salts is insoluble in water at room temperature but soluble in boiling water

Options

A. `CaCl_(2)`
B. `BaCl_(2)`
C. `SrCl_(2)`
D. `PbCl_(2)`

Answer

D

Explanation

Chlorides of alkaline earth metals are soluble in water at room temperature.
Due to inert pair effect in `PbCl_(2)`, it is an ionic compound. High temperature is required to overcome the high lattice energy of `PbCl_(2)` in the solution.