Which one of the following salts on being dissolved in water gives $pH > 7$ at $25^{\circ} C$?

The aqueous solution of which of the following will have the highest $pH$?

At $25 \ ^\circ C$,a weak acid $HX$ has the dissociation constant $K_a = 1 \times 10^{-5}$. It forms a salt $NaX$ on reaction with an alkali. The percentage of degree of hydrolysis of a $0.1 \ M$ solution of $NaX$ is $..... \%$.

For a $0.01 \ M$ solution of $NaOCl$,the $K_h$ value is $10^{-6}$. The degree of hydrolysis of the salt is .........$\%$.

Calculate the $pH$ on mixing $100 \ mL$ of $0.2 \ M \ HCN$ with $400 \ mL$ of $0.05 \ M \ KOH$ at $25 \ ^\circ C$ ($pK_b$ for $CN^- = 8$).

Calculate the percentage of hydrolysis in $0.01 \ M$ aqueous solution of $NaOCN$ ($K_b$ for $OCN^{-} = 10^{-10}$)