Which among the following salt solutions is basic in nature?

Repeated use of which of the following fertilizers would increase the acidity of the soil?

On dilution,the $pH$ of $CH_3COONH_4$ solution:

If the dissociation constant of $HCN$ is $1.3 \times 10^{-9}$ and $K_w = 1 \times 10^{-14}$,then the $pH$ and percentage of hydrolysis of $\frac{N}{100} \ KCN$ are respectively:

Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest $pH$ value?

Calculate the $pH$ of a $0.5 \ M$ aqueous solution of $KCN$. Given that $pK_{b}$ for $CN^{-} = 4.70$. (in $.5$)