Question:
Identify weakest acid from following.
Identify weakest acid from following.
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Acid strength rises with the number of oxygen atoms on chlorine: HClO is weakest.
Updated On: Oct 1, 2026
- Hypochlorous acid
- Chlorous acid
- Chloric acid
- Perchloric acid
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
In oxoacids of the same element, more oxygen atoms pull electron density away from the O-H bond and stabilise the anion. So acidity rises with oxidation state of chlorine.
Step 2: Detailed Explanation
The acids are \(\text{HOCl}\) (+1), \(\text{HClO}_2\) (+3), \(\text{HClO}_3\) (+5) and \(\text{HClO}_4\) (+7).
Order of acidity: \(\text{HOCl} < \text{HClO}_2 < \text{HClO}_3 < \text{HClO}_4\).
Hypochlorous acid, with only one oxygen, is the weakest.
Final Answer:
Hypochlorous acid is the weakest, option (A). \[ \boxed{\text{HOCl}} \]
In oxoacids of the same element, more oxygen atoms pull electron density away from the O-H bond and stabilise the anion. So acidity rises with oxidation state of chlorine.
Step 2: Detailed Explanation
The acids are \(\text{HOCl}\) (+1), \(\text{HClO}_2\) (+3), \(\text{HClO}_3\) (+5) and \(\text{HClO}_4\) (+7).
Order of acidity: \(\text{HOCl} < \text{HClO}_2 < \text{HClO}_3 < \text{HClO}_4\).
Hypochlorous acid, with only one oxygen, is the weakest.
Final Answer:
Hypochlorous acid is the weakest, option (A). \[ \boxed{\text{HOCl}} \]
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