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Heating potassium dichromate with concentrated sulphuric acid in the presence of a soluble chloride evolves reddish-brown vapours of:

1. CrO3
2. Cr2O3
3. CrCl3
4. CrO2Cl2

Correct answer: CrO2Cl2

Solution

The chloride is oxidised in the presence of dichromate and conc. H2SO4 to give chromyl chloride, CrO2Cl2, seen as red-brown vapours.

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