The aqueous solution of disodium hydrogen phosphate $(Na_2HPO_4)$ is:

Consider the following aqueous solutions:
$(1)$ $FeCl_3$ is basic
$(2)$ $NH_4Cl$ is acidic
$(3)$ $NaCN$ is acidic
$(4)$ $Na_2CO_3$ is basic
Which of the following statements is $NOT$ correct?

$pH$ of $NH_4Cl$ solution is $5.28$. Calculate the degree of hydrolysis $(h)$ of its $0.02 \ M$ solution.

Dissolving $NaCN$ in de-ionised water will result in a solution having

Which among the following salts forms a basic solution when dissolved in water?

In a solution of sodium acetate,the concentration of $CH_3COOH$ is equal to which of the following?