A mixture on heating with conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \...

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A mixture on heating with conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) and \( \mathrm{MnO}_{2} \) liberates reddish brown vapours of
\( \mathrm{P} \)
(1) \( \mathrm{Br}_{2} \)
(2) \( \mathrm{NO} \)
W
(3) \( \mathrm{I}_{2} \)
(4) \( \mathrm{Cl}_{2} \)
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