Question

Which of the following statement(s) is/are correct? 

(A) The pH of 1 x 10^-8 M HCl solution is 8

(B) The conjugate base H₂PO₄ is HPO₄^2-

(C) Kw increases with increase in temperature

(D) When a solution of weak monoprotic acid is titrated against a strong base at half neutralisation point, pH = 1/2 pK_a

Choose the correct answer from the option given below.

(1) (B), (C), (D)

(2) (A), (D)

(3) (A), (B), (C)

(4) (B), (C)

Answer 1

Correct option is (4) (B), (C)

(A) pH of 10^-8 M HCl is in acidic range (6.98).

(B) Conjugate Base of H₂PO\(^-_4\) is HPO\(^{2}_4\)

(C) K_w increases with increasing Temperature, as the temperature increases, the dissociation of water increases.

(D) At half neutralisation point, half of the acid is present in the form of salt.

pH = Pk_a + log 1/1 = Pk_a