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Question

Two test tubes containing nitrate and bromide are treated separately with conc. H2SO4; brown fumes evolved are passed in water. The water will be coloured by vapours evolved from the test tube containing

A

Nitrate
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B

Bromide
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C

Both (A) and (B)
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D

None of these
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Solution

The correct option is B
Bromide
The water will be coloured by vapours evolved from the test tube containing bromide.
Br2+H2OBrown colour
NO2+H2OColourless.
Br2​ impart a brown color to the aqueous solution while NO2​ does not.

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