OnlineCBT
Chemistry · PYQ NEET UG 2017
हिन्दीName the gas that can readily decolourise acidified \( \text{KMnO}_4 \) solution.
Correct answer · Option 1
\( \text{SO}_2 \)
Explanation
Sulfur dioxide (\( \text{SO}_2 \)) is a strong reducing agent that reduces purple \( \text{MnO}_4^- \) to colourless \( \text{Mn}^{2+} \), thereby decolourising acidified \( \text{KMnO}_4 \).
