When \( \mathrm{H}_{2} \mathrm{O}_{2} \) is shaken with an acidified solution of \( \mathrm{K}_{...

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When \( \mathrm{H}_{2} \mathrm{O}_{2} \) is shaken with an acidified solution of \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) in the presence of ether, the ethereal.layer turns blue due to the formation of :
(WB JEE 2012)
\( P \)
(a) \( \mathrm{Cr}_{2} \mathrm{O}_{3} \)
(b) \( \mathrm{CrO}_{4}^{2-} \)
(c) \( \mathrm{Cr}_{2}\left(\mathrm{SO}_{3}\right)_{3} \)
(d) \( \mathrm{CrO}_{5} \)
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