Question

Consider the following statements
(a) HF is stronger acid than H20
(b) BF3 is a Lewis acid
(c) Conjugate bases of weak acids are very strong
The correct statements are
(a) and (b) only
(b) and (c) only
(a) and (c) only
(a), (b) and (c)​

Answer 1

Answer:

(a) , (b) and (c)

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Answer 2

Answer:

The correct statement  are (a), (b) and (c).

Explanation:

• HF is stronger acid than $H_{2}O$ because it can easily break into $H^{+}$ and $F^{-}$. The conjugate base $F^{-}$ of HF is weaker than that of  $OH^{-}$ of water. Therefore $HF$ is stringer acid than  $H_{2}O$.
• $BF_{3}$ is Lewis acid because it is electron deficient. It can accept the electron from in its empty p-orbital from the electron rich species. Therefore $BF_{3}$  behaves as lewis acid.
• According to Bronsted Lowry concept, Conjugate base of weak acid is a strong base.

                  $CH_{3}COOH$ + $H_{2}O$   ⇄   $CH_{3}COO^{-}$ + $H_{3}O^{+}$

      Here  $CH_{3}COOH$ is a weak acid but  $CH_{3}COO^{-}$ is its strong   conjugate base.

Therefore all the given statements are correct.