The aqueous solution of disodium hydrogen phosphate $(Na_2HPO_4)$ is:

Match the column $I$ with column $II$ and mark the appropriate choice.

Column $I$	Column $II$
$A$. $CH_3COONa$	$i$. Almost neutral,$pH > 7$ or $< 7$
$B$. $NH_4Cl$	$ii$. Acidic,$pH < 7$
$C$. $NaNO_3$	$iii$. Alkaline,$pH > 7$
$D$. $CH_3COONH_4$	$iv$. Neutral,$pH = 7$

$A$ solution of sodium acetate in water will

$A$ $100 \ L$ solution of $KCN$ undergoes $3.7\%$ hydrolysis. If the dissociation constant of $HCN$ is $7.2 \times 10^{-10}$,find the value of $K_w$.

If a $0.01 \ M \ NaCN$ solution is $3.37 \%$ hydrolyzed,calculate the value of $K_h$.

Which one of the following salts gives an aqueous solution which is weakly basic?