In the brown ring test,the brown colour of th | vedclass

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(D) The brown ring test is used to detect the presence of nitrate ions $(NO_{3}^{-})$. When a nitrate salt is treated with freshly prepared $FeSO_{4}$

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nitrosoferrous sulphate

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(D) The brown ring test is used to detect the presence of nitrate ions $(NO_{3}^{-})$. When a nitrate salt is treated with freshly prepared $FeSO_{4}$ solution followed by the careful addition of concentrated $H_{2}SO_{4}$ along the sides of the test tube,a dark brown ring is formed at the junction of the two layers. The chemical reactions involved are: $NaNO_{3} + H_{2}SO_{4} \rightarrow NaHSO_{4} + HNO_{3}$ $2HNO_{3} + 6FeSO_{4} + 3H_{2}SO_{4} \rightarrow 3Fe_{2}(SO_{4})_{3} + 2NO + 4H_{2}O$ $FeSO_{4} + NO \rightarrow [Fe(H_{2}O)_{5}(NO)]SO_{4}$ The brown ring is due to the formation of the complex $[Fe(H_{2}O)_{5}(NO)]SO_{4}$,which is known as nitrosoferrous sulphate.

In the brown ring test,the brown colour of the ring is due to

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