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  4. The brown ring test for nitrates depends on

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Q. The brown ring test for nitrates depends on

CMC MedicalCMC Medical 2009

Solution:

The brown ring is obtained due to the formation of pentaaquanitrosonium ion. In this reaction reduction of nitrate ion by $ F{{e}^{2+}} $ ion takes places as $ NO_{3}^{-}+3F{{e}^{2+}}+4{{H}^{+}}\xrightarrow{{}} $ $ NO+3F{{e}^{3+}}+2{{H}_{2}}O $ $ F{{e}^{2+}}+NO+5{{H}_{2}}O\xrightarrow{{}}\underset{brown\,\,complex}{\mathop{{{[Fe{{({{H}_{2}}O)}_{5}}NO]}^{2+}}}}\, $