Question

Which compound has minimum solubility in water?

• A. $Ca(OH{)}_2$
• B. $Be(OH{)}_2$
• C. $Mg(OH{)}_2$
• D. $Ba(OH{)}_2$

Answer 1

The correct option is B $Be(OH{)}_2$

Solubility of alkaline earth metal hydroxides increases down the group. This trend can be explained by the decrease in the lattice energy of the hydroxide salt and by the increase in the coordination number of the metal ion as you go down the group. $Be(OH{)}_2$ is insoluble in water.