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)` ?
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. `Cr_(2)O_(7)^(-2)` is reduced to `Cr^(+3)`
D. Chromyl chloride is formed
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. `Cr_(2)O_(7)^(-2)` is reduced to `Cr^(+3)`
D. Chromyl chloride is formed
Correct Answer – A,B,D
Chromylchloride test
`4NaCl+K__(2)Cr_(2)O_(7)+3H_(2)SO_(4)overset(“heat”)(rarr)underset(“chromyl chloride (orange red)”)(K_(2)SO_(4)+2Na_(2)SO_(4)+2CrO_(2)Cl_(2)+3H_(2)O)`
`4NaOH+CrO_(2)Cl_(2)rarr underset(“sod. Chromate (yellow)”)(2NaCl+Na_(2)CrO_(4)+2H_(2)O)`
`Na_(2)CrO_(4)+(CH_(3)COO)_(2)Pbrarrunderset((“Lead chromate yellow ppt.”))(2Ch_(3)COONa+PbCrO_(4)darr)`