Question

Which among the following oxoacids of chlorine exhibits \(+3\) oxidation state of chlorine?

• A. \(\text{HClO}\)
• B. \(\text{HClO}_2\)
• C. \(\text{HClO}_3\)
• D. \(\text{HClO}_4\)

Hint:

Calculate the oxidation number of Cl in HClO, HClO2, HClO3 and HClO4.

Answer 1

The Correct Option is B

Step 1: Rule:
Each extra oxygen atom raises the oxidation state of chlorine by 2, starting from +1 in HClO.

Step 2: Sequence:
HClO is +1, HClO$_2$ is +3, HClO$_3$ is +5, HClO$_4$ is +7.

Step 3: Answer:
Option (B).

Final Answer:
Option (B). \[ \boxed{\text{(B) } \text{HClO}_2} \]