H2O2 when shaken with acidified K2Cr2O7 ...

`H_2O_2` when shaken with acidified `K_2Cr_2O_7` soln in ether the ether layer turns blue due to formation of

A

`Cr_2O_3`

B

`CrO_6^(2-`

C

`Cr_2(SO_4)_3`

D

`CrO_5`

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