Which of the following salt solutions is highly acidic?

If $pK_b$ for $CN^{-}$ at $25\,^{\circ}C$ is $3.7$,what is the $pH$ of a $0.5\, M$ aqueous $NaCN$ solution?

Do you expect different products in solution when aluminium $(III)$ chloride and potassium chloride are treated separately with $(i)$ normal water,$(ii)$ acidified water,and $(iii)$ alkaline water? Write equations wherever necessary.

If the $pK_a$ of acetic acid and $pK_b$ of dimethylamine are $4.76$ and $3.26$ respectively,the $pH$ of dimethylammonium acetate solution is

At $25^{\circ} C$, the ionization constant for anilinium hydroxide is $5.00 \times 10^{-10}$. The hydrolysis constant of anilinium chloride is

The concentration of $[H^{+}]$ in a $0.1 \, M \, CH_3COONa$ solution [$K_a = 10^{-5}$] is equal to ......