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 of H2, – PO is – 4 HPO . (C) Kw increases with increase in temperature. (D) When

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 of H2, – PO is – 4 HPO . (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 = 2 1 pKa. Choose the correct answer from the options given below:

(A) (A), (B), (C)
(B) (B), (C)
(C) (A), (D)
(D) (B), (C), (D)

Prashant Kotian · Accepted Answer

Correct answer: B. (A) (B) The conjugate base of H2, – PO is – 4 HPO . (C) Kw increases with increase in 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. So it forms acidic buffer solution. pH = pka + ] acid [ ] salt [ log pH = pka + 1 log pH = pka.

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