$A$ solution of sodium cyanide $(NaCN)$ is . . . . . . .

The degree of hydrolysis of a salt of a weak acid and a weak base in its $0.1 \ M$ solution is found to be $50 \ \%$. If the molarity of the solution of the same salt is $0.5 \ M$,then the percentage degree of hydrolysis of the salt should be ......... $\%.$

Which of the following salt solutions is highly acidic?

The aqueous solution of $CH_3COONa$ is .......

$A$ $0.02 \ M$ solution of pyridinium hydrochloride has $pH = 3.44$. Calculate the ionization constant of pyridine.

Which of the following salts does not undergo hydrolysis?