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  4. In Lassaigne’s test, a blue colour is obtained if the organic compound contains nitrogen. The blue colour is due to

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Q. In Lassaigne’s test, a blue colour is obtained if the organic compound contains nitrogen. The blue colour is due to

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Solution:

In Lassaigne’s test, a blue colour is obtained if the organic compound contains nitrogen. The Prussian blue is due to $Fe_{4}\left[\right.Fe\left(\right.CN\left(\left.\right)_{6}\left(\left]\right.\right)_{3}$ is formed.