First slide

Boronsted-Lowry theory

Question

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.

Easy

A

Both statements I and II are correct.
B

Statement I is correct and statement II is incorrect.
C

Statement I is incorrect and statement II is correct.
D

Both statements I and II are incorrect.

Solution

The acid-base pair that differs only by one proton is called a conjugate acid-base pair. In the example of dissolution of ${NH}_{3} in H_{2} O, {OH}^{-}$ is called the conjugate base of an acid $H_{2} O and {NH}_{4}^{+}$ is called conjugate acid of the base ${NH}_{3}$ . 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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