Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the ___________________?
Correct answer: B. Absence of air
- A. Presence of an inert atmosphere
- B. Absence of air
- C. Presence of a reducing atmosphere
- D. Presence of an oxidising atmosphere
Explanation
Yellow phosphorus is heated at about 250–450°C without air to prevent oxidation while its molecular structure changes to the red form. An inert atmosphere may also be used in practice, but the standard condition is absence of air.
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