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4. d and f- block elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
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
$\mathrm{KMnO}_{4}+\mathrm{SO}_{2} \rightarrow \mathrm{MnSO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{K}_{2} \mathrm{SO}_{4}$

Where $MnSO_4$ is colourless solution

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