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Chemistry
Sometimes, the colour observed in Lassaigne’s test for nitrogen is green. It is because
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Q. Sometimes, the colour observed in Lassaigne’s test for nitrogen is green. It is because
BITSAT
BITSAT 2016
A
of green colour of ferrous sulphate
25%
B
ferric ferrocyanide is also green
12%
C
of green colour of copper sulphate
0%
D
of excess of $Fe^{3+}$ ions whose yellow colour makes the blue colour of ferric ferrocyanide to appear green.
62%
Solution:
Although blue coloured ferric ferrocyanide is formed but due to the presence of yellow coloured $Fe^{3+}$ salts, the blue colour gives the shade of green.