Mix of \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{KCl} \) when heated with conc. \...

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Mix of \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{KCl} \) when heated with conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) forms red vapours of?
(1) \( \mathrm{CrO}_{3} \)
(2) \( \mathrm{CrO}_{2} \mathrm{Cl}_{2} \)
(3) \( \mathrm{Cr}_{2} \mathrm{O}_{3} \)
(4) \( \mathrm{CrO} \)
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