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Which of the following statement(s) is/are correct ? (A) The pH of 1 × 10 –8 M HCl solution is 8 (B) The conjugate base of H 2 PO 4 – is HPO 4 2– (C) K w 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 pK a Choose the correct answer from the options given below :

1. (B), (C)
2. (A), (D)
3. (A), (B), (C)
4. (B), (C), (D)

Correct answer: (B), (C)

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