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CGP EDU Academic Team
Published on: August 14, 2026
When a crystaline compound (X) is heated with K 2 Cr 2 O 7 and concentrated H 2 SO 4 , a deep red gas
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(X) = NH 4 Cl, = CrO 2 Cl 2 , = Na 2 CrO 4 , = PbCrO 4 , = 
Sol. 4Cl – + Cr 2 O 7 2– + 6H + 
2CrO 2 Cl 2 (deep red) + 3H 2 O
CrO 2 Cl 2 + 4OH – 
CrO 4 2– (yellow solution) + 2Cl – + 2H 2 O
CrO 4 2– + Pb 2+ 
PbCrO 4 ↓ (yellow)
NH 4 Cl + NaOH 
NaCl + NH 3 + H 2 O
NH 3 + K 2 Hg Ι 4 + H 2 O 
+ 4K Ι + 3H Ι
So, (X) = NH 4 Cl, = CrO 2 Cl 2 , = Na 2 CrO 4 , = PbCrO 4 , = 
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