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Which of the following is correct?

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${CrO}_{3}$ has peroxide bond in the structure.

Heating ${({NH}_{4})}_{2} {Cr}_{2} O_{7}$ produces ${Cr}_{2} O_{3}$ along with $O_{2}$

Acidification of $K_{2} {Cr}_{2} O_{7}$ turns it yellow

${Cl}_{2}$ is liberated in little amount when $K_{2} {Cr}_{2} O_{7}$ , $KCl$ and conc. $H_{2} {SO}_{4}$ are heated together.

answer is D.

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Detailed Solution

Potassium dichromate react with potassium chloride and sulfuric acid to produce chromyl chloride ${CrO}_{2} {Cl}_{2}$ which forms red vapours. In the compound Cr is in +6 oxidation state.

$K_{2} {Cr}_{2} O_{7} + 4 KCl + 3 H_{2} {SO}_{4} \to 2 {CrO}_{2} {Cl}_{2} + 3 K_{2} {SO}_{4} + 3 H_{2} O$

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