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Which statement is not true with respect to nitrate ion test ?

1. A dark brown ring is formed at the junction of two solutions.
2. Ring is formed due to nitroferrous sulphate complex.
3. The brown complex is [Fe(H 2 O) 5 (NO)]SO 4 .
4. Heating the nitrate salt with conc. H 2 SO 4 , light brown fumes are evolved.

Correct answer: Ring is formed due to nitroferrous sulphate complex.

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