Question:
Which anion of the simple salt can be confirmed by Brown ring test?
Which anion of the simple salt can be confirmed by Brown ring test?
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The brown ring is composed of the nitrosoferrous sulfate complex, which forms only in the presence of nitrate ions.
Updated On: Jun 9, 2026
- \(NO_2^-\)
- \(NO_3^-\)
- \(Br^-\)
- \(SO_4^{2-}\)
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The Correct Option is B
Solution and Explanation
Concept:
The Brown ring test is a qualitative chemical test used specifically to detect the presence of nitrate ions (\(NO_3^-\)) in a solution.
Step 1: Describe the reaction.
When a freshly prepared ferrous sulfate solution is added to a nitrate solution, followed by the careful addition of concentrated sulfuric acid, a brown complex is formed at the junction of the two liquids.
Step 2: Chemical reaction involved.
The reaction sequence is: \[ NO_3^- + 3Fe^{2+} + 4H^+ \rightarrow NO + 3Fe^{3+} + 2H_2O \] \[ [Fe(H_2O)_6]^{2+} + NO \rightarrow [Fe(H_2O)_5(NO)]^{2+} + H_2O \] The complex \([Fe(H_2O)_5(NO)]^{2+}\) is the brown ring. \[ \boxed{NO_3^-} \]
Step 1: Describe the reaction.
When a freshly prepared ferrous sulfate solution is added to a nitrate solution, followed by the careful addition of concentrated sulfuric acid, a brown complex is formed at the junction of the two liquids.
Step 2: Chemical reaction involved.
The reaction sequence is: \[ NO_3^- + 3Fe^{2+} + 4H^+ \rightarrow NO + 3Fe^{3+} + 2H_2O \] \[ [Fe(H_2O)_6]^{2+} + NO \rightarrow [Fe(H_2O)_5(NO)]^{2+} + H_2O \] The complex \([Fe(H_2O)_5(NO)]^{2+}\) is the brown ring. \[ \boxed{NO_3^-} \]
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