why do nitrates give brown ring test with ferrous ion in the presence of conc.H2SO4
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The test is based on the fact that nitrate ion acts as an oxidizing agent. In the reaction mixture reduction of nitrate ion takes place by iron (II) and iron(II) gets oxidized to iron (III). Nitric oxide is reduced to NO- and forms nitrosonium complex which forms a brown ring at the junction of two layers.
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