Which of the following aqueous solutions will have a $pH$ less than $7.0$?

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

Calculate $[H^{+}]$ at the equivalence point during the titration of $25 \ mL$ of $0.1 \ M$ weak acid $HA$ $(K_a = 10^{-5})$ with $0.05 \ M \ NaOH$ solution.

Which of the following is an acidic salt?

If the $K_b$ value in the hydrolysis reaction $B^{+} + H_2O \rightleftharpoons BOH + H^{+}$ is $1.0 \times 10^{-6}$,then the hydrolysis constant of the salt would be

Why is the following anionic hydrolysis correct?
$X^{-} + H_2O \rightleftharpoons HX + OH^{-}$