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Q.

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

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a

of green colour of ferrous sulphate

b

fenic ferrocyanide is also green

c

of green colour of copper sulphate

d

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