The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is
  1. $\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3$
  2. $\mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]$
  3. $\mathrm{Fe}(\mathrm{CN})_3$
  4. $\mathrm{Na}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]$

Solution

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Asked in: JEE Main 2004

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