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+H2SO4→K2SO4+2HBr↑ 2HBr+H2SO4→2H2O+SO2↑Br2↑(reddishbrown)