Brown Ring Test
Brown ring test is confirmatory for:
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About This Question
- Subject
- chemistry
- Chapter
- principles related to practical chemistry
- Topic
- brown ring test
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Nitrate
The Brown Ring Test is highly sensitive for detecting the Nitrate (NO3−) ion.
- Solution containing nitrate is mixed with fresh Ferrous sulfate (FeSO4).
- Concentrated H2SO4 is added carefully along the sides of the test tube.
- Result: A brown ring forms at the junction of the two liquid layers.
- Chemical Identity: The ring is due to the formation of the complex [Fe(H2O)5NO]2+ (Nitroso-ferrous sulfate). The nitrate is reduced to nitrous oxide (NO) by Fe2+, which kemudian coordinates with another Fe2+ ion.
This easy difficulty chemistry question is from the chapter principles related to practical chemistry, covering the topic of brown ring test. It appeared in the 2025 exam.
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