The $pH$ of an aqueous solution of alum is ....

The degree of hydrolysis in hydrolytic equilibrium $A^{-} + H_2O \rightleftharpoons HA + OH^{-}$ at salt concentration of $0.001 \ M$ is $(K_a = 1 \times 10^{-5})$

Which of the following statements is true for an aqueous solution of $CuSO_4$?

Calculate the $pH$ on mixing $100 \ mL$ of $0.2 \ M \ HCN$ with $400 \ mL$ of $0.05 \ M \ KOH$ at $25 \ ^\circ C$ ($pK_b$ for $CN^- = 8$).

Which of the following salts on dissolution in water gives $pH$ less than $7$ at $298 \ K$?

If a $0.01 \ M \ NaCN$ solution is $3.37 \%$ hydrolyzed,calculate the value of $K_h$.