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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 3pn156

When solid NaBr is heated with concentrated sulphuric acid, the products include

A $NaBrO X_{3}$ and $SO X_{3}$
B $Br X_{2}$ and $H X_{2} S$ only
C $Br X_{2}$ and $SO X_{2}$
D $HBr$ only, with no redox reaction

Answer: C

HBr is first formed but is a reducing agent:

2 HBr + H X_{2} SO X_{4} Br X_{2} + SO X_{2} + 2 H X_{2} O

. Concentrated H2SO4 oxidises HBr to bromine and is itself reduced to SO2. (HCl from NaCl is not oxidised in this way.)

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