When H_2 O_2 is added to ice cold solution of acidified potassium...

When

\mathrm{H}_2 \mathrm{O}_2

is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand

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Aa blue colour is obtained in ether because of formation of $\mathrm{CrO}_5$
Ba blue colour is obtained in ether because of formation of $\mathrm{CrO}_3$
Ca blue colour is obtained in ether because of formation of $\mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3
Dchromyl chloride is formed

A. a blue colour is obtained in ether because of formation of $\mathrm{CrO}_5$

When

\mathrm{H}_2 \mathrm{O}_2

is added to acidified potassium dichromate in ether solution, potassium dichromate is oxidised to blue peroxide of chromium

\left(\mathrm{CrO}_5\right)

which is soluble in ether and produces blue coloured solution.

\begin{aligned} & \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+\mathrm{H}_2 \mathrm{SO}_4+4 \mathrm{H}_2 \mathrm{O}_2 \longrightarrow \\ & 2 \mathrm{CrO}_5+\mathrm{K}_2 \mathrm{SO}_4+5 \mathrm{H}_2 \mathrm{O} \\ & \end{aligned}