Which is the correct expression for the hydrolysis constant $(K_h)$ of $NH_4CN$?

$A$ weak acid $HX$ has the dissociation constant $1 \times 10^{-5} \ M$. It forms a salt $NaX$ on reaction with alkali. The degree of hydrolysis of $0.1 \ M$ solution of $NaX$ is......$\%$

In which of the following salts,only cationic hydrolysis is involved?

Heating an aqueous solution of aluminium chloride to dryness will give

If the dissociation constant of $HCN$ is $10^{-7}$,what are the values of $pH$,$h$ (degree of hydrolysis),and $[OH^-]$ for a $10^{-3} \ M$ solution of $KCN$,respectively?

What is hydrolysis? Give the difference between non-hydrolyzing and hydrolyzing ions.