Which statements about chromyl chloride, CrO2Cl2, and its formation in the chromyl chloride test are correct? One or more options may be correct.

The molecule is tetrahedral and diamagnetic.

Chromium is in the +6 oxidation state.

A bromide treated in the same way gives red CrO2Br2 vapours.

The molecule is tetrahedral and diamagnetic.

Chromium is in the +6 oxidation state.

Its formation from dichromate and chloride is a redox reaction in which chloride is oxidised.

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3qa090

Which statements about chromyl chloride, $CrO X_{2} Cl X_{2}$ , and its formation in the chromyl chloride test are correct? One or more options may be correct.

AA bromide treated in the same way gives red $CrO X_{2} Br X_{2}$ vapours.
BThe molecule is tetrahedral and diamagnetic.
CChromium is in the $+ 6$ oxidation state.
DIts formation from dichromate and chloride is a redox reaction in which chloride is oxidised.

Cr is

+ 6

(

d^{0}

) in a tetrahedral, diamagnetic molecule. No oxidation state changes occur (Cr stays

+ 6

, Cl stays

- 1

), so formation is not a redox process. Bromide is oxidised by the acidic dichromate/concentrated

H X_{2} SO X_{4}

Br X_{2}

instead, so no chromyl bromide forms. Correct: first and third.