Which of the following statement (s) is /are correct ?
(A) The P^H of 1 x 10^-8 M HCl solution is 8.
(B) The conjugate base of $H_{2} {PO}_{4}^{-} is {HPO}_{4}^{2 -}$
(C) K_W increases with increase in temperature.
(D) When a solution of a weak monoprotic acid is titrated against a strong base at half neutralization point, $P^{H} = \frac{1}{2} {pK}_{a}$
Choose the correct answer from the options given below:

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(B), (C) ,(D)

(B), (C)

(A), (D)

(A), (B), (C)

answer is A.

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Detailed Solution

(A) The P^H of 1 x 10^-8 M HCl solution is 8.
(B) The conjugate base of $H_{2} {PO}_{4}^{-} is {HPO}_{4}^{2 -}$
(C) K_W increases with increase in temperature.
(D) At half neutralization point, half of the acid is present in the form of salt. So it forms acidic buffer solution.
$\begin{array}{l} P^{H} = P^{ka} + \log \frac{[salt]}{[acid]} \\ P^{H} = P^{ka} + \log \frac{1}{1} \\ P^{H} = P^{ka} \end{array}$