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(C) The reaction for the detection of $NO_2^{-}$ (or $NO_3^{-}$) is the brown ring test.In this test,$Fe^{2+}$ ions react with $NO$ in the presence of

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The complex formed is $[Fe(H_2O)_5NO]^{2+}$

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(C) The reaction for the detection of $NO_2^{-}$ (or $NO_3^{-}$) is the brown ring test.In this test,$Fe^{2+}$ ions react with $NO$ in the presence of water to form the brown-coloured complex $[Fe(H_2O)_5NO]^{2+}$.In this complex,the oxidation state of $Fe$ is calculated as: $x + 0 + 0 = +2$,so $x = +2$.Therefore,the correct statement is that the complex formed is $[Fe(H_2O)_5NO]^{2+}$.

The following reaction is performed for detection of $NO_2^{-}$: $FeSO_4 + NO \rightarrow$ Product. Choose the correct statement.

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