NEET2013ChemistryGeneral Organic ChemistryActual
Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?
Options
- AFe ₃ [ Fe ( CN )₆ ]₂
- BFe ₄ [ Fe ( CN )₆ ]₃
- CFe ₄ [ Fe ( CN )₆ ]₂
- DFe ₃ [ Fe ( CN )₆ ]₃
Correct answer
B. Fe ₄ [ Fe ( CN )₆ ]₃
Step-by-step solution
Sodium ferrocyanide 3 Na ₄ [ Fe ( CN )₆ ] +2 Fe ₂ ( SO ₄ )₃ Ferric ferrocyanide (Prussian blue) Fe ₄ [ Fe ( CN )₆ ]₃ + Na ₂ SO ₄