Sometimes, the colour observed in Lassaigne's test for nitrogen is green. It is because

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of green colour of ferrous sulphate

fenic ferrocyanide is also green

of green colour of copper sulphate

of excess of Fe3+ ions whose yellow colour makes the blue colour of ferric ferrocyanide appear green.

answer is D.

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Detailed Solution

Although blue coloured ferric ferrocyanide is formed but due to the presence of yellow coloured Fe3+ salts, the blue colour gives the shade of green.

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