Question

Identify weakest acid from following.

• A. Hypochlorous acid
• B. Chlorous acid
• C. Chloric acid
• D. Perchloric acid

Hint:

Acid strength rises with the number of oxygen atoms on chlorine: HClO is weakest.

Answer 1

The Correct Option is A

Step 1: Compare anions
More oxygen atoms spread the negative charge of the anion over more atoms, making it more stable.

Step 2: Rank
$\text{ClO}^-$ is the least stable and $\text{ClO}_4^-$ the most stable.

Step 3: Answer
So HOCl is the weakest acid, option (A).

Final Answer:
Option (A). \[ \boxed{\text{HOCl}} \]