$A$ solution of sodium chloride in contact with the atmosphere has a $pH$ of about

Which of the following produce an alkaline solution when dissolved in water?
$(i)$ Borax
$(ii)$ Potash alum
$(iii)$ $Na_2CO_3$
$(iv)$ $NH_4NO_3$

Calculate $K_h$ and $pH$ of $0.1 \ M$ $NH_4Cl$ solution. [ $K_w = 1 \times 10^{-14}$,$K_{NH_4OH} = 1.75 \times 10^{-5}$ ]

Which of the following salt solutions turns red litmus blue?

The $pK_a$ of a weak acid,$HA,$ is $4.80.$ The $pK_b$ of a weak base,$BOH,$ is $4.78.$ The $pH$ of an aqueous solution of the corresponding salt,$BA,$ will be

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