Benzoic acid is a weak acid wih a $p K_{a}$ of 4.19.

A strong acid

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A strong base

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Neutral

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All ofthese

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Solution

The correct option is B A strong base
Being an organic acid, Benzoic acid is a weak acid. Acid means it leaves proton in aqueous solution. The faster the rate of leaving proton, the more strong the acid is. Due to the resonance structure of benzoic acid, power of leaving proton is restricted and that's why its ability to leave proton is restrained.
We know also higher $p K_{a}$ value means weaker acid or stronger base.

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Similar questions

Question 05.
Sodium carbonate is a basic salt because it is a salt of
(a) strong acid and strong base
(b) weak acid and weak base
(c) strong acid and weak base
(d) weak acid and strong base

Q. What is a strong acid?
what is a weak acid?

Q. A weak monobasic acid is half neutralised by a strong base. If the pH of the solution is

5.4

, its

p K_{a}

is:

Q. Match the List-I (solution of salts) with List-II (pH of the solution) and select the correct answer using the codes given below the lists:

List-I	List-II
A. Weak acid and strong base	1. $1 / 2 p K_{w}$
B. Strong acid and weak acid	2. $1 / 2 [p K_{w} - p K_{b} + l o g c]$
C. Weak acid and weak base	3. $1 / 2 [p K_{w} - p K_{b} - l o g c]$
D. Strong acid and strong base	4. $1 / 2 [p K_{w} + p K_{a} + l o g c]$

Q. Assertion: The conjugate base of a weak acid is a strong base.
Reason: Elements that are strong Bronsted-Lowry acids are not strong Bronsted-Lowry bases.

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Benzoic acid is a weak acid wih a pKa of 4.19.

Benzoic acid is a weak acid wih a $p K_{a}$ of 4.19.