$NH_{4}Cl$ is acidic due to

If the $pKa$ of lactic acid is $5$,then the $pH$ of $0.005 \ M$ calcium lactate solution at $25^{\circ} \ C$ is $........ \times 10^{-1}$ (Nearest integer). The structure of lactic acid is given below:

$pH$ of $10^{-3} \ M$ $NaCl$ solution at $25 \ ^oC$ is

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:

Which of the following has the highest degree of hydrolysis?

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