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]2+
(iv) FeSO4.HNO3
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]2+
(iv) FeSO4.HNO3
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1 Answer
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This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (i)
The 'Brown Ring Test' is an identification and conformation test of the nitrate ion (NO3- ) using conc. H2SO4 and newly produced FeSO4. Place the NO3- containing sample in a test tube. Then, with gentle shaking, add conc H2SO4 dropwise, heat it briefly on a Bunsen burner, and add freshly made greenish FeSO4 Then, due to the creation of brown coloured [Fe (H2O)5 (NO)]SO4 complex, a brown ring forms in that test tube.
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