Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at ____________ °C in absence of air?
Correct answer: A. 250-400
- A. 250-400
- B. 50-80
- C. 1000-1200
- D. 800-900
Explanation
Yellow or white phosphorus changes to the more stable red allotrope when heated at about 250–400°C in the absence of air. Excluding air prevents oxidation during this allotrope conversion.
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