Which of the following salts will not undergo hydrolysis?

Arrange the aqueous solutions of the following salts in the increasing order of $pH$: $CuSO_4$ $(I)$,$NaCN$ $(II)$,$KCl$ $(III)$.

When $C_6H_5NH_3^+ Cl^-$ salt is dissolved in water,it undergoes hydrolysis. Find the equilibrium constant of the hydrolysis reaction if the ionization constant of the weak base is $10^{-4}$.

Which of the following salt solutions turns red litmus blue?

Which one of the following salts gives an aqueous solution which is weakly basic?

Which of the following salts when dissolved in water will get hydrolysed?