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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Sulphur allotropes, SO2, sulphuric acid, oxyacids of sulphur

JEE Main levelSingle correct optionDifficulty 2 of 3pn080

In which of the following reactions does $SO X_{2}$ act as an oxidising agent?

A $2 SO X_{2} + O X_{2} 2 SO X_{3}$
B $5 SO X_{2} + 2 MnO X_{4} X^{-} + 2 H X_{2} O 5 SO X_{4} X^{2 -} + 2 Mn X^{2 +} + 4 H X^{+}$
C $SO X_{2} + Cl X_{2} SO X_{2} Cl X_{2}$
D $SO X_{2} + 2 H X_{2} S 3 S + 2 H X_{2} O$

Answer: D

Only in the reaction with

H X_{2} S

does sulphur of

SO X_{2}

go from +4 to 0, i.e. it is reduced. In the other reactions S goes from +4 to +6, so

SO X_{2}

is the reductant.

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