1.

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)?

Answer»

A DEEP red vapour is evolved.
The vapour when passed through NaOH solution, gives a yellow solution.
Chlorine gas is also evolved.
Chromyl chloride is formed.

Solution :This is a chromyl chloride test.
`K_(2)Cr_(2)O_(7)+6H_(2)SO_(4)+4NaCl rarr 2KHSO_(4)+4NaHSO_(4)+UNDERSET("(orange red vapour)")underset("chromyl chloride")(2CrO_(2)Cl_(2))+3H_(2)O`
`4NaOH+CrO_(2)Cl_(2)rarr underset("(yellow)")(Na_(2)CrO_(4))rarr2NaCl+2H_(2)O`


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