Question

Red phosphorus can be prepared from white phosphorus by:

• A. Heating it in an inert atmosphere for several days
• B. Distilling it in inert atmosphere
• C. Dissolving it in carbon disulphide and crystallising
• D. Melting it and pouring the liquid into water

Answer 1

The correct option is A Heating it in an inert atmosphere for several days

Red phosphorus is obtained by heating white phosphorus at $573K$ in an inert atmosphere for several days.

$\text{White phosphorus}\underset{\text{Several days}}{\overset{\Delta }{\to }}\text{Red phosphorus}$