When \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) crystals a...

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When \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) crystals are heated with
P concentrated \( \mathrm{HCl} \), the gas evolved is

W
(1) \( \mathrm{O}_{2} \)
(2) \( \mathrm{Cl}_{2} \)
(3) \( \mathrm{CrO}_{2} \mathrm{Cl}_{2} \)
(4) \( \mathrm{HCl} \)
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