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  4. 4K2Cr2O7 ->[Heat] 4K2CrO4 + 3O2 + X. In the above reaction X is:

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Q. $\ce{4K2Cr2O7 ->[Heat] 4K2CrO4 + 3O2 + X. }$
In the above reaction X is:

ManipalManipal 2005

Solution:

Potassium dichromate, on heating gives oxygen and chromic oxide $\ce{(Cr2O3)}$.
$\ce{4K2Cr2O7 ->[\Delta] 4K2CrO4 + 3O2 + 2Cr2O3 }$