Question

What is oxidation state of chlorine in chlorous acid?

• A. \(+2\)
• B. \(+4\)
• C. \(+3\)
• D. \(+7\)

Hint:

Write the formula HClO2 and balance charges to zero.

Answer 1

The Correct Option is C

Step 1: Recognise the acid series
The oxoacids of chlorine are HClO (+1), HClO2 (+3), HClO3 (+5) and HClO4 (+7).

Step 2: Verify for HClO2
$+1 + x - 4 = 0$ gives $x = +3$, which is option (C).

Final Answer:
+3. \[ \boxed{\text{(C)}\ +3} \]