Question

What is the oxidation state of chlorine atom in chlorous acid?

• A. $+3$
• B. $+1$
• C. $+2$
• D. $-1$

Hint:

For oxyacids, calculate oxidation states by assigning standard values to hydrogen and oxygen first.

Answer 1

The Correct Option is A

Step 1: Write the formula of chlorous acid.
Chlorous acid has the formula $HClO_2$.
Step 2: Assign oxidation states.
Oxidation state of hydrogen $= +1$
Oxidation state of oxygen $= -2$
Step 3: Calculate oxidation state of chlorine.
Let the oxidation state of chlorine be $x$.
\[ (+1) + x + 2(-2) = 0 \]
\[ +1 + x - 4 = 0 \]
\[ x = +3 \]
Step 4: Conclusion.
The oxidation state of chlorine in chlorous acid is $+3$.