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(A) The brown ring test is a standard laboratory test used to detect the presence of the nitrate ion $(NO_3^-)$ in a solution.In this test,freshly pre

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$NO_3^{-}$

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(A) The brown ring test is a standard laboratory test used to detect the presence of the nitrate ion $(NO_3^-)$ in a solution.In this test,freshly prepared ferrous sulfate $(FeSO_4)$ solution is added to the aqueous solution containing nitrate ions,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 interface of the two layers due to the formation of the nitroso-ferrous sulfate complex.The chemical reactions involved are:$2HNO_3 + 3H_2SO_4 + 6FeSO_4 \rightarrow 3Fe_2(SO_4)_3 + 2NO + 4H_2O$$[Fe(H_2O)_6]SO_4 + NO \rightarrow [Fe(H_2O)_5(NO)]SO_4 + H_2O$

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

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