Analytical Chemistry Question 11
Question: Nitrate is confirmed by ring test. The brown colour of the ring is due to the formation of
[EAMCET 1979; AFMC 1981, 88, 90; RPET 1999; MP PMT 2000; MP PET 2002; CPMT 2004]
Options:
A) Ferrous nitrite
B) $ FeSO_4NO $
C) $ FeSO_4NO_2 $
D) Ferrous nitrate
Show Answer
Answer:
Correct Answer: B
Solution:
When $ NO_3^{-} $ is passed through $ FeSO_4 $ (neutral) and then few drops of conc. $ H_2SO_4 $ is added then the brown ring is obtained. $ \underset{\begin{smallmatrix} \\ \end{smallmatrix}}{\mathop{FeSO_4\ +\ NO\ }}\underset{\text{Nitroso Ferrousulphate}}{\mathop{\underset{\text{(Brown}\ \text{ring)}}{\mathop{\to Fe(NO)SO_4}}}} $
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