Which of the following statement (s) is/are correct ? When a mixture of NaCl and `K_(2)Cr_(2)O_(7)` is gently warmed with conc. `H_(2)SO_(4)`.

Options

A. a deep red vapour is evolved
B. the vapour when passed into NaOH solution gives a yellow solution of `Na_(2) CrO_(4)`
C. chlorine gas is evolved
D. chromyl chloride is formed

Answer

A, B, D

Explanation

The chemical equation for the given reaction is,
`2Cl^(-) +K_(2) Cr_(2) O_(7) + H_(2) SO_(4) to K_(2) SO_(4) + underset(("Red vapours"))underset("chloride")underset("Chromly")(2CrO_(2)Cl_(2))+H_(2)O`
`Cr O_(2) Cl_(2) + 4NaOH to underset("solution")underset("Yellow")(Na_(2)CrO_(4))+2NaCl+2H_(2)O`