The $pK_{a}$ of a weak acid $HA$ is $4.80$ and the $pK_{b}$ of a weak base $BOH$ is $4.78$. What is the $pH$ of an aqueous solution of the salt $BA$?

An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of

Assertion : $A$ solution of $FeCl_3$ in water produces brown precipitate on standing.
Reason : Hydrolysis of $FeCl_3$ takes place in water.

The solution of $Na_2CO_3$ has $pH$:

Explain the following with reasons:
$(i)$ $NaCl$ solution is neutral. The solution of strong acid and strong base salts is neutral.
$(ii)$ $NaCH_3COO$ solution is basic. The solution of strong base and weak acid salt is basic.
$(iii)$ $NH_4Cl$ solution is acidic. The solution of weak base and strong acid salt is acidic.
$(iv)$ The solution of $NH_4CH_3COO$ is (almost) neutral. The solution of weak acid - weak base salts is almost neutral.

In the equilibrium $A^{-} + H_{2}O \rightleftharpoons HA + OH^{-}$ $(K_{a} = 1.0 \times 10^{-5})$,the degree of hydrolysis of a $0.001 \ M$ solution of the salt is: