Question

Amongst the following hydroxides, the one which has the highest value of $K_{sp}$ at ${25}^{\circ }$ $C$ is:

• A. $KOH$
• B. $CsOH$
• C. $LiOH$
• D. $RbOH$

Answer 1

The correct option is B $CsOH$

Going down Group-I in the periodic nature, the ionic nature of the hydroxides increases. As ionic nature increases, the solubility also increases. Hence, the solubility product is maximum for $CsOH$.