1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion (A) Elementary phosphorus exists in three principal allotropic forms, i.e. white (or yellow), red (or violet) and black. Reason (R) Of the three forms, white phosphorus is the most important and most reactive.

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Q. Assertion $(A)$ Elementary phosphorus exists in three principal allotropic forms, i.e. white (or yellow), red (or violet) and black.
Reason $(R)$ Of the three forms, white phosphorus is the most important and most reactive.

AIIMSAIIMS 2015

Solution:

Elementary phosphorus exists in three principal allotropic forms known as white (or yellow), red (or violet) and black phosphorus. Of the three forms, white phosphorus is the most important and most reactive.