Which of the following statement (s) is (are) correct ?
(1) . The pH of `1.0 xx 10^(-8)` M solution of HCI is 8
(2). The conjugate base of `H_(2)PO_(4)^(-) " is " HPO_(4)^(2-)`
(3). Autoprotolysis constant of water increases with temperature
(4). When a solution of a weak monoprotic acid is titrated against a strong base at half neutralization point pH`= (1//2) pK_(a)`

Options

A. `2,3`
B. `1,2,3`
C. `3,4`
D. `2,3,4`

Answer

A

Explanation

Ph of 10^(-8)` M HCI is not 8 bu it is less than 7. Only choices 2,3 are correct.