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

What should be the degree of hydrolysis of $0.01 \ M$ Lithium formate solution at $25 \ ^oC$,if $K_h = 3.175 \times 10^{-5}$?

Which of the following aqueous solutions will have the highest $pH$?

Amongst the following,the total number of compounds whose aqueous solution turns red litmus paper blue is
$KCN$,$K_2SO_4$,$(NH_4)_2C_2O_4$,$NaCl$,$Zn(NO_3)_2$,$FeCl_3$,$K_2CO_3$,$NH_4NO_3$,$LiCN$

If the dissociation constant of $HCN$ is $10^{-7}$,what are the values of $pH$,$h$ (degree of hydrolysis),and $[OH^-]$ for a $10^{-3} \ M$ solution of $KCN$,respectively?

The aqueous solution of which of the following will have the highest $pH$?