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NEET 2013

Exam: NEET
Year: 2013
Subject: Chemistry
Chapter: General Organic Chemistry

NEET 2013 · Chemistry · General Organic Chemistry

Nitrogen detection in an organic compound is carried out by...

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

A $\mathrm{Fe}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]_2$
B $\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3$
C $\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_2$
D $\mathrm{Fe}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3$

Correct answer

B. $\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3$

Step-by-step solution

\underset{\text{Sodium ferrocyanide}}{3 \mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]}+2 \mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3 \rightarrow \underset{\substack{\text{Ferric ferrocyanide} \ \text{(Prussian blue)} }}{\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3}+\mathrm{Na}_2 \mathrm{SO}_4

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