When $CuSO_4$ is hydrated,it becomes:

Aqueous solution of ferric chloride is

Which of the following aqueous solutions will have the highest $pH$?

The $pH$ of a $NaCl$ solution is:

$A$ weak acid $HX$ has the dissociation constant $1 \times 10^{-5} \ M$. It forms a salt $NaX$ on reaction with alkali. The degree of hydrolysis of $0.1 \ M$ solution of $NaX$ is......$\%$

For the reaction $HCOO^{-} + H_2O \rightleftharpoons HCOOH + OH^{-}$,which of the following relations is correct?