\( \mathrm{KBr} \), on reaction with conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \), gives reddish-b...

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\( \mathrm{KBr} \), on reaction with conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \), gives reddish-brown gas:
(a) Bromine
(b) Mixture of bromine and \( \mathrm{HBr} \)
(c) \( \mathrm{HBr} \)
(d) \( \mathrm{NO}_{2} \)
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