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Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of: (a) CrO 3 (b) Cr 2 O 3 (c)

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

(a) CrO₃

(b) Cr₂O₃

(d) CrO₂Cl₂

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