What will be the $pH$ of an aqueous solution of $MgCl_2$?

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

For a weak acid $HA$,$pK_a = 4.80$. For a weak base $BOH$,$pK_b = 4.78$. What is the $pH$ of an aqueous solution of the salt $BA$?

Which of the following will not undergo hydrolysis in water?

Which among the following salt solutions in water is acidic in nature?

At $25 \ ^\circ C$,a weak acid $HX$ has the dissociation constant $K_a = 1 \times 10^{-5}$. It forms a salt $NaX$ on reaction with an alkali. The percentage of degree of hydrolysis of a $0.1 \ M$ solution of $NaX$ is $..... \%$.