The ring test is shown by compounds having:
Correct answer: C. Nitrate radical
- A. Sulphate radical
- B. Chloride radical
- C. Nitrate radical
- D. None of the above
Explanation
The brown ring test is a qualitative analysis technique used to detect the presence of nitrate ions. When a solution containing nitrate ions is treated with freshly prepared ferrous sulfate and then carefully added to concentrated sulfuric acid, a brown ring forms at the interface between the two layers. This indicates the presence of the nitrate radical. Sulphate and chloride radicals do not produce such a ring. The sulphate radical is typically detected by forming a white precipitate with barium chloride, while the chloride radical forms a white precipitate with silver nitrate.
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Spectroscopy studies how substances absorb, emit or interact with electromagnetic radiation. Coverage includes ultraviolet-visible absorption, infrared identification of functional groups, Beer-Lambert law, spectral interpretation and the use of spectroscopic data to identify or determine the concentration of chemical substances.
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