Repeated use of which of the following fertilizers would increase the acidity of the soil?

The correct relationship between the hydrolysis constant $(K_h)$ and the dissociation constant $(K_b)$ for $MgCl_2$ is:

The formula $K_h = K_w / K_a$ is applicable to which of the following salts?

An aqueous solution of aluminium sulphate would show

If the dissociation constant of $HCN$ is $1.3 \times 10^{-9}$ and $K_w = 1 \times 10^{-14}$,then the $pH$ and percentage of hydrolysis of $\frac{N}{100} \ KCN$ are respectively:

If the value of $K_b$ is $10^{-5}$,find the $K_h$ value for a salt of (strong acid - weak base) at $363 \ K \ (90 \ ^\circ C)$. [At $90 \ ^\circ C, K_w = 10^{-12}$]