Identify the correct statements from the following. (A) The ionic product of water at $100^{\circ}…
Identify the correct statements from the following.
(A) The ionic product of water at $100^{\circ} \mathrm{C}$ is $ < 10^{-14}$.
(B) $\mathrm{pH}$ of a solution decreases with increasing temperature.
(C) $\mathrm{NaH}_2 \mathrm{PO}_4$ on hydrolysis gives a basic solution.
(D) $\mathrm{NH}_3$ can act both as Bronsted acid and base.
B, C, D
A, B, C
A, C, D
A, B, D
Solution
(A) The ionic product of water at $100^{\circ} \mathrm{C}$ is $51.3 \times 10^{-14}$. So, this statement is incorrect.
(B) On increasing the temperature, $\mathrm{pH}$ of solution also decreases.
(C) Since, $\mathrm{Na}_2 \mathrm{HPO}_4$ is a salt of strong base $\mathrm{NaOH}$ and weak acid $\mathrm{H}_3 \mathrm{PO}_4$, it gives a basic solution on hydrolysis.
(D). $\mathrm{NH}_3$ can act as both Bronsted acid and base because it can accept $\mathrm{H}^{+}$ion to form $\mathrm{NH}_4^{+}$and donate $\mathrm{H}^{+}$ion to form $\mathrm{NH}_2^{-}$.
Hence statements B, C, D are correct.