A test tube containing a nitrate and another containing a bromide a...

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A test tube containing a nitrate and another containing a bromide and \( \mathrm{MnO}_{2} \) are treated with concentrated \( \mathrm{H}_{2} \mathrm{SO}_{4} \).
P The reddish brown fumes evolved are passed through

W water. The water will be coloured by:
(a) the nitrate
(b) the bromide
(c) both
(d) none of the two
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