Same chapter3 marksDifficulty: Medium
Give two examples showing that concentrated nitric acid is a powerful oxidising agent.
Study of Compounds: Nitric Acid
3 marksDifficulty: Medium
Describe the brown ring test for a nitrate.
Original Khojo Papers practice question — not from a past board paper.
Answer
The salt solution is mixed with freshly prepared iron(II) sulphate solution and concentrated sulphuric acid is poured gently down the side of the tube so that it forms a layer below. A brown ring appears where the two liquids meet, which shows that a nitrate is present.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The brown ring is a complex formed between iron(II) sulphate and the nitric oxide liberated.
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