Home Chemistry Redox Reaction Karnataka - CET Previous Year Question The brown ring test for nitrates depends on
Chemistry Redox Reaction Karnataka - CET Previous Year Question Single Correct MCQ
Published on: August 13, 2026

The brown ring test for nitrates depends on

A
the reduction of nitrate to nitric oxide
B
oxidation of nitric oxide to nitrogen dioxide
C
reduction of ferrous sulphate to iron
D
oxidising action of sulphuric acid.

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The correct answer is:
A

: The brown ring is appeared due to the formation of a brown complex between nitric oxide (formed as a result of reduction of the nitrate ion by the ions) and ions.

Pentaaquanitrosonium iron (I)

(Brown complex)

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