$pH$ of a salt solution of weak acid $(pK_a = 4)$ and weak base $(pK_b = 5)$ at $25^{\circ}C$ is:

Which of the following dissolves in water to give a neutral solution?

The $pH$ of ammonium phosphate solution,if $pK_a$ of phosphoric acid and $pK_b$ of ammonium hydroxide are $5.23$ and $4.75$ respectively,is ..... .

Solutions of equal concentration of the following substances are prepared separately. Which of these solutions will have the minimum $pH$?

Calculate the $pH$ of a $1.0 \, M$ ammonium formate solution,given that $K_a = 1 \times 10^{-4}$ and $K_b = 1 \times 10^{-5}$.

If the $K_b$ value in the hydrolysis reaction $B^{+} + H_2O \rightleftharpoons BOH + H^{+}$ is $1.0 \times 10^{-6}$,then the hydrolysis constant of the salt would be