Identify the weak acid-weak base salt from the following.

If the base ionization constant $(K_b)$ of hydrazine $(N_2H_4)$ is $9.6 \times 10^{-9}$,what is the percentage of hydrolysis of a $0.1 \ M$ solution of the salt $N_2H_5Cl$?

The addition of solid sodium carbonate $(Na_2CO_3)$ to pure water causes:

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

The $pH$ of an aqueous solution of $MgCl_2$ is .......

Identify the salt that undergoes hydrolysis and forms an acidic solution from the following.