Same chapter3 marksDifficulty: Medium
Describe the brown ring test for a nitrate.
Study of Compounds: Nitric Acid
3 marksDifficulty: Medium
Write the equation for the laboratory preparation of nitric acid and state why an all-glass apparatus is used.
Original Khojo Papers practice question — not from a past board paper.
Answer
KNO3 + H2SO4 → KHSO4 + HNO3, warmed below 200 °C. An all-glass retort is used because nitric acid vapour attacks rubber and cork.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The temperature is kept below 200 °C so that the nitric acid does not decompose into nitrogen dioxide, oxygen and water.
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