D-And F-Block Elements Ques 145
Question: When conc. sulphuric acid is added slowly to a solution of ferrous sulphate containing nitrate ion, a brown colour ring is formed. The composition of the ring is
[CPMT 1989]
Options:
A) $ [Fe{{(H_2O)}_5}NO]SO_4 $
B) $ FeSO_4.NO_2 $
C) $ Fe[{{(H_2O)}_5}]{{(NO_3)}_2} $
D) None of these
Show Answer
Answer:
Correct Answer: A
Solution:
$ NO_3^{-}+H_2SO_4\to HNO_3+HSO_4^{-} $
$ 2HNO_3\to H_2O+2NO+3[O] $
$ FeSO_4+NO+5H_2O\to \underset{\text{Brown colour}}{\mathop{[Fe{{(H_2O)}_5}N{{O}^{+}}],SO_4}}, $
