A) \[[Fe{{({{H}_{2}}O)}_{5}}NO]S{{O}_{4}}\]
B) \[[Fe{{({{H}_{2}}O)}_{4}}NO]S{{O}_{4}}\]
C) \[[Fe({{H}_{2}}O)N{{O}_{2}}]S{{O}_{4}}\]
D) none Of these
Correct Answer: A
Solution :
All the compounds containing nitrate \[(N{{\overset{-}{\mathop{O}}\,}_{3}})\] ion give ring test. In this test we add freshly prepared \[\text{FeS}{{\text{O}}_{\text{4}}}\]solution to the aqueous solution of compound and then add conc. \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]carefully by the side of the test tube. A dark brown ring of \[[Fe{{({{H}_{2}}O)}_{5}}NO]S{{O}_{4}}\] at the interface between two liquids is formed.
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