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Question

A test tube containing a nitrate and another containing a bromide and MnO2 are treated with conc. H2SO4. The brown fumes evolved are passed in water. The water will be coloured by the :

A
nitrate
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B
bromide
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C
both (A) and (B)
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D
none of the above
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Solution

The correct option is D bromide
A test tube containing a nitrate and another containing a bromide and MnO2 are treated with conc. H2SO4. The brown fumes evolved are passed in water. The water will be coloured by the bromide.
2KBr+H2SO4K2SO4+2HBr
2HBr+H2SO42H2O+SO2Br2(reddish brown)

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