A brown ring is formed in the ring test for NO3

Question:

 A brown ring is formed in the ring test for NO3

ion. It is due to the formation of

(i) [Fe(H2O)5 (NO)]2+

(ii) FeSO4.NO2

(iii) [Fe(H2O)4 (NO)]2+

(iv) FeSO4.HNO3

Solution:

Option (i) [Fe(H2O)5 (NO)]2+ is the answer.

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