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$$\text{NO}_3^-$$ ion is detected by a popular test known as brown ring test. During this test $$\text{NO}_3^-$$ ion acts as
In the brown ring test, $$\text{Fe}^{2+}$$ reduces $$\text{NO}_3^-$$ to NO, $$\text{NO}_3^- + 3\text{Fe}^{2+} + 4\text{H}^+ \rightarrow \text{NO} + 3\text{Fe}^{3+} + 2\text{H}_2\text{O}$$, and NO then forms the brown complex $$[\text{Fe(H}_2\text{O)}_5\text{NO}]^{2+}$$. Since nitrate is reduced, it acts as the oxidant.
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