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

The hydrolysis constant of $0.01 \ M$ methylamine hydrochloride is....... [ Given: $K_b = 5 \times 10^{-4} $ ]

$20\,mL$ of $0.1\,M\,NH_{4}OH$ is mixed with $40\,mL$ of $0.05\,M\,HCl$. The $pH$ of the mixture is nearest to. (Given: $K_{b}(NH_{4}OH) = 1 \times 10^{-5}, \log 2 = 0.30, \log 3 = 0.48, \log 5 = 0.69, \log 7 = 0.84, \log 11 = 1.04$) (in $.2$)

An aqueous solution of aluminium sulphate shows

Which among the following salts turns red litmus blue in its aqueous solution?

Heating an aqueous solution of aluminium chloride to dryness will give