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Sometimes, the colour observed in Lassai...

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

A

of green colour of ferrous sulphate

B

ferric ferrocyanide is also green

C

of green colour of copper sulphate

D

of excess of `Fe^(3+)` ions whose yellow colour makes the blue colour of ferric ferrocyanide to appear green.

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The correct Answer is:
D
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