4K2Cr2O7→heat4K2CrO4+3O2+X. In the above reaction X is

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CrO3

Cr2O7

Cr2O3

CrO5

answer is C.

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Detailed Solution

Potassium dichromate, on heating gives oxygen and chromic oxide Cr2O3.4K2Cr2O7→Δ4K2Cr2O4+3O2+2Cr2O3

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