Ferrous sulfate (FeSO4) produces a brown ring complex with________________?
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Answer: C. NO
Explanation
Nitric oxide coordinates with iron ions to form the characteristic colored coordination complex. The brown ring test relies on generating nitric oxide in situ to react with ferrous sulfate. Coordination chemistry explains the formation of the colored nitroso-iron complex during nitrate detection assays. The brown ring test is a classic qualitative analytical procedure used to detect nitrate ions in solution. Ferrous sulfate acts as a reducing agent that converts nitrate into nitric oxide under acidic conditions. Transition metal complexes often exhibit distinct coloration due to d-d electronic transitions in the metal center.
Analytical laboratories use this qualitative test routinely to identify the presence of nitrates in water samples. Environmental testing procedures depend on reliable chemical color changes to detect common pollutant ions. Coordination complexes play vital roles in both analytical chemistry and biological oxygen transport systems. Nitrogen trioxide is a higher nitrogen oxide that does not participate directly in this specific complex. Nitrogen dioxide is a reddish-brown gas but does not form the stable aqueous coordination ring described. Nitrous oxide is a relatively inert anesthetic gas that fails to produce the required brown ring complex.
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