An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of which of the following?

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

The $pH$ of a $0.02 \ M \ NH_4Cl$ solution will be [given $K_b \ (NH_4OH) = 10^{-5}$ and $\log \ 2 = 0.301$ ]

An aqueous solution of aluminium sulphate shows

The correct formula for the $pK_h$ value of a salt formed from a weak acid and a weak base is .....

Calculate the hydrolysis constant $(K_h)$ for a salt containing $NO_2^-$. Given that the dissociation constant $(K_a)$ for $HNO_2$ is $4.5 \times 10^{-4}$ and the ionic product of water $(K_w)$ is $1.0 \times 10^{-14}$.