Q.

Which one of the following forms of phosphorus is most reactive?

A. Black phosphorus
B. White phosphorus
C. Violet phosphorus
D. Red phosphorus
Answer» B. White phosphorus
Explanation: White phosphorus is the most reactive form of phosphorus. It is made up of discrete P4 tetrahedra which are subjected to very high angular strain as the angles is 60 degrees. This high angular strain makes white phosphorus unstable and highly reactive. It ignites spontaneously at about 50°C, and at much lower temperatures if finely divided.
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