D-And F-Block Elements Ques 495

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

Options:

A) $ CrO_3 $

B) $ CrCl_3 $

C) $ CrO_2Cl_2 $

D) $ Cr_2O_3 $

Show Answer

Answer:

Correct Answer: C

Solution:

Solid potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride gives orange red vapours of a volatile oily liquid $ CrO_2Cl_2 $

$ K_2Cr_2O_7+4NaCl+6H_2SO_4 $ $ \underset{chromylchloride}{\mathop{\xrightarrow{{}}2KHSO_4}},+4NaHSO_4+2CrO_2Cl_2 $



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