Which of the following statements are correct ?The pH of `1.0 xx 10^(-8) M` solution of HCl is 8, The conjugate base of `H_(2)PO_(4)^(ɵ)` is `HPO_(4)^(2-)`, The autoprotolysis constant of water increases with temperature, Whan a solution of a weak monoprotic acid is treated against a strong base, at half-neutralisation point, pH `= (1//2)pK_(a)`.

Options

A. The pH of `1.0 xx 10^(-8) M` solution of HCl is 8
B. The conjugate base of `H_(2)PO_(4)^(ɵ)` is `HPO_(4)^(2-)`
C. The autoprotolysis constant of water increases with temperature
D. Whan a solution of a weak monoprotic acid is treated against a strong base, at half-neutralisation point, pH `= (1//2)pK_(a)`.

Answer

B, C

Explanation

(A) The pH of `1.0 xx 10^(-8)M` solution of HCl is not 8, it is less than 7.
(B) `H_(2)PO_(4)^(ɵ) hArr HPO_(4)^(2-) + H^(o+)`
(C ) Autoprotolysis constant of water or ionic product of water increases with increase in temperature.
(D) When a solution of a weak monoprotic acid is treated against a strong base, at half-neutralisation point pH = `pK_(a)`.