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}}, $



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