Question

Which of the following is the molecular formula of halous acid of chlorine?

• A. HClO
• B. HClO$_2$
• C. HClO$_3$
• D. HClO$_4$

Hint:

Hypo...ous (+1), ...ous (+3), ...ic (+5), Per...ic (+7).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Chlorine forms four types of oxoacids, and their nomenclature depends on the oxidation state of chlorine.
Step 2: Key Formula or Approach:
- Hypohalous acid: \(+1\) state
- Halous acid: \(+3\) state
- Halic acid: \(+5\) state
- Perhalic acid: \(+7\) state
Step 3: Detailed Explanation:
For chlorine:
- \(\text{HClO}\) (Ox. State \(+1\)): Hypochlorous acid.
- \(\text{HClO}_2\) (Ox. State \(+3\)): Chlorous acid (Halous acid).
- \(\text{HClO}_3\) (Ox. State \(+5\)): Chloric acid.
- \(\text{HClO}_4\) (Ox. State \(+7\)): Perchloric acid.
Step 4: Final Answer:
The halous acid of chlorine is HClO$_2$.