MCQ
Name the gas that can readily decolourise acidified $KMnO_4$ solution.
- ✓$SO_2$
- B$NO_2$
- C$P_2O_5$
- D$CO_2$
✓
Answer
Correct option: A.
$SO_2$
a
$\mathrm{KMnO}_{4}+\mathrm{SO}_{2} \rightarrow \mathrm{MnSO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{K}_{2} \mathrm{SO}_{4}$
$\mathrm{KMnO}_{4}+\mathrm{SO}_{2} \rightarrow \mathrm{MnSO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{K}_{2} \mathrm{SO}_{4}$
Where $MnSO_4$ is colourless solution
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