Statement I : The acid-base pair that differs only by one proton is called a conjugate acid-base pair.Statement II: If Bronsted acid is a strong acid then its conjugate base is a weak base and vice-versa.

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Both statements I and II are correct.

Statement I is correct and statement II is incorrect.

Statement I is incorrect and statement II is correct.

Both statements I and II are incorrect.

answer is A.

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Detailed Solution

The acid-base pair that differs only by one proton is called a conjugate acid-base pair. In the example of dissolution of NH3 in H2O,OH- is called the conjugate base of an acid H2O and NH4+ is called conjugate acid of the base NH3. If Bronsted acid is a strong acid then its conjugate base is a weak base and vice-versa. It may be noted that conjugate acid has one extra proton and each conjugate base has one less proton. A strong acid can easily give up its proton to produce a weaker-base.

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