Two test tubes containing a nitrate and a bromide are treated separately with `H_(2)SO_(4)`; brown fumes evolved are passed in water . The water will be coloured by vapours evolved from the test tube containing:

Options

A. the nitrate
B. the bromide
C. both
D. none of the two

Answer

B

Explanation

`NO_(3)^(-)` gives `NO_(2)` with concentrated `H_(2)SO_(4)` which on passing through water form colourless `HNO_(3)`(l) and `HNO_(2)(l). Br^(-) + MnO_(2)` on heating with concentrated `H_(2)SO_(4)` gives `Br_(2)` gas which on passing through water imparts it a reddish brown colour.