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Question

On shaking H2O2 with acidified potassium dichromate and ether, the ethereal layer becomes:

A
Green
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B
Red
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C
Blue
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D
Black
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Solution

The correct option is C Blue
The blue colouration is due to the formation of CrO5.

K2Cr2O7+H2SO4+4H2O2K2SO4+2CrO5Blue+5H2O

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