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  4. 4K2Cr2O7 xrightarrow textheat 4K2CrO4 + 3O2 + X In the above reaction X is:

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Q. $4K_2Cr_2O_7 \xrightarrow{\text{heat}} 4K_2CrO_4 + 3O_2 + X$
In the above reaction $X$ is:

ManipalManipal 2005The d-and f-Block Elements

Solution:

Potassium dichromate, on heating gives oxygen and chromic oxide $(Cr_2O_3)$.
$4K_2Cr_2O_7 \xrightarrow{\Delta} 4K_2CrO_4 + 3O_2 + 2Cr_2O_3$