Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Which of the following statement is correct when a mixture of NaCl and K 2 Cr 2 O 7 is gently warmed with conc. H 2 SO 4 ?
1 . a deep red vapour is evolved
2. The vapour when passed into NaOH solution gives a yellow solution of Na 2 CrO 4
3. chlorine gas is evolved
4. chromyl chloride is formed
Text Solution
Verified by ExpertsThe correct answer is:
A
1, 2, 4
4NaCl + K 2 Cr 2 O 7 + 6H 2 SO 4 (conc.) 
2KHSO 4 + 4NaHSO 4 + 
+ 3H 2 O
Chromyl chloride vapours when passed through NaOH solution gives a yellow solution of Na 2 CrO 4 .
CrO 2 Cl 2 + 4NaOH 
Na 2 CrO 4 + 2NaCl + 2H 2 O
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