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