Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K?

Question

Canvas Classes · Accepted Answer

When red phosphorus is heated in a sealed tube at 803 K (530°C):

- Red phosphorus converts to -black phosphorus (the thermodynamically stable form at high temperature and pressure)
- -black phosphorus is formed at lower temperatures
- White/yellow phosphorus would require different conditions

Answer: Option (4) — -Black phosphorus

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