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(A) The brown ring test is a common laboratory test used to detect the presence of the nitrate ion $(NO_3^-)$ in a solution. When a freshly prepared f

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$NO_3^-$

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(A) The brown ring test is a common laboratory test used to detect the presence of the nitrate ion $(NO_3^-)$ in a solution. When a freshly prepared ferrous sulfate $(FeSO_4)$ solution is added to the nitrate solution,followed by the careful addition of concentrated sulfuric acid $(H_2SO_4)$ along the sides of the test tube,a brown ring is formed at the junction of the two layers. The brown ring is due to the formation of the complex $[Fe(H_2O)_5(NO)]^{2+}$.

The brown ring test is used to detect the presence of which ion?

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