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

Question:

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

  1. White phosphorus

  2. Yellow phosphorus 

  3. $\beta$-Black phosphorus

  4. $\alpha$-Black phosphorus


Correct Option: , 4

Solution:

When red phosphorus is heated in a sealed tube at $803 \mathrm{~K}, \alpha$-black phosphorus is formed.

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