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Which of the following statement (s) is ...

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

Text Solution

Verified by Experts

The correct Answer is:
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)`
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