When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of....?

(A) CrO3

(B) Cr2O3

(C) CrO5

(D) CrO4^-2

Solution:

When acidified solution of  K2Cr2O7 are shaken with H2O2 in presence of ether , the ethereal layer turn blue due to the formation of CrO5 ( deep blue in colour).

Hence option (C) is correct.

Butterfly Structure of CrO5

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