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Among the following, the brown ring is due to the formation of

1. [Fe(NO) 2 (SO 4 ) 2 ] 2–
2. [Fe(NO) 2 (H 2 O) 4 ] 3+
3. [Fe(NO) 4 (SO 4 ) 2 ]
4. [Fe(NO) (H 2 O) 5 ] 2+

Correct answer: [Fe(NO) (H 2 O) 5 ] 2+

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