A colourless inorganic compound (A) imparts a green colour to the flame. Its solution gives a white ppt. (B) with `H_(2)SO_(4)`. When heated with `K_(2)Cr_(2)O_(7)` and conc. `H_(2)SO_(4)`, a brown red vapour/gas (C) is formed. The gas/ vapour when passed through aqueous NaOH solution, it turns into a yellow solution (D) which forms yellow precipitate (E) with `CH_(3)COOH` and `(CH_(3)COO)_(2)Pb`. with reference to above information, answe the following questions.
Q. The liberated gas vapour (C) is:

Options

A. `Br_(2)`
B. `NO_(2)`
C. `CrO_(2)Cl_(2)`
D. `Cl_(2)`

Answer

C

Explanation