JEE Main2013Chemistryd and f Block ElementsActual

Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of :

Options

ACrO ₃
BCrCl ₃
CCrO ₂ Cl ₂
DCr ₂ O ₃

Correct answer

C. CrO ₂ Cl ₂

Step-by-step solution

Solid potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride gives orange red vapours of a volatile oily liquid CrO ₂ Cl ₂ K ₂ Cr ₂ O ₇+4 NaCl +6 H ₂ SO ₄ 2 KHSO ₄+4 NaHSO ₄+2 CrO ₂ Cl ₂ chromyl chloride

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