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BITSAT 2016
Exam
BITSAT
Year
2016
Subject
Chemistry
Chapter
Practical Chemistry

BITSAT 2016 · Chemistry · Practical Chemistry

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

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

Options

  1. Aof green colour of ferrous sulphate
  2. Bferric ferrocyanide is also green
  3. Cof green colour of copper sulphate
  4. Dof excess of Fe ^{3+}ionswhoseyellowcolourmakesthebluecolourofferricferrocyanidetoappeargreen.ions whose yellow colour makes the blue colour of ferric ferrocyanide to appear green.

Correct answer

D. of excess of Fe ^{3+}ionswhoseyellowcolourmakesthebluecolourofferricferrocyanidetoappeargreen.ions whose yellow colour makes the blue colour of ferric ferrocyanide to appear green.

Step-by-step solution

Although blue coloured ferric ferrocyanide is formed but due to the presence of yellow coloured Fe3+\mathrm{Fe}^{3+} salts, the blue colour gives the shade of green.
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