Which of the following salts will not undergo hydrolysis?

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

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

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

The hydrolysis constant of $0.1 \ M$ ammonium chloride is $2.5 \times 10^{-10}$. Its degree of hydrolysis is......

If the $pK_a$ value of $CH_3COOH$ is $4.74$,then the $pH$ value of $0.1 \ M \ CH_3COONa$ is ......