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JEE Main · 2022 · 26 Jun 2022 · Shift 1 · Practical and Analytical Chemistry

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Which statement is not true with respect to nitrate ion test?
  1. (A)A dark brown ring is formed at the junction of two solutions.
  2. (B)Ring is formed due to nitroferrous sulphate complex.✓ Correct
  3. (C)The brown complex is .
  4. (D)Heating the nitrate salt with conc. , light brown fumes are evolved.

Answer: (B)

Solution

In the brown ring test for nitrate ions, the brown ring is formed due to the formation of nitrosoferrous sulphate complex , not nitroferrous sulphate. The nitrate ion is reduced to nitric oxide (NO) by , and this NO coordinates with to form the characteristic brown complex. Statement (B) incorrectly names the complex as "nitroferrous sulphate" instead of "nitrosoferrous sulphate."

JEE Main · 2022 · 26 Jun 2022 · Shift 1 · Single correct option

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