Ionic Equilibrium Part 2

Which of the following statement(s) is/are correct?
(A) The pH of 1×10−8M‌HCl solution is 8
(B) The conjugate hase of H2PH4−is HPO42−
(C) Kw increases with increase in temperature.
(D) When a solution of a weak monoprotic acid is titrated against a strong base at half neutralisation point.
pH=‌

1

2

pKa
Choose the correct answer from the options given below