1.

A mixture of NaCl and K_(2)Cr_(2)O_(7) is heated with conc. H_(2)SO_(4) ,deep red vapours and formed .Which of the following statements is false?

Answer»

The vapours contain `CrO_(2)Cl_(2)` only
The vapours give a yellow solution with NaOH
The vaopurs when passed into LEAD acetate in acetic give a yellow precipitate.
The vapours contain `CrO_(2)Cl_(2)` and `Cl_(2)`

Solution :`4NaCl+K_(2)Cr_(2)O_(7)+3H_(2)SO_(4)to2NaS_(2)O_(4)+K_(2)SO_(4)+2CrO_(2)Cl_(2)+3H_(2)O`
CHROMYL chloride test is a C.T for `Ci^(-)`
`CrO_(2)Cl_(2)+underset(("yellow"))(4NaOH)toNa_(2)Cro_(4)+2H_(2)O+2NaCl`
`Na_(2)CrO_(4)+underset("yellow ppt")((CH_(3)CrO)_(2))pbtopbCro_(4)+2CH_(3)COONa`


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