Question

Reason
Of the three forms, white phosphorus is the most important and most reactive

Read the above assertion and reason and choose the correct statement regarding it.

Assertion
Elementary phosphorus exists in three principal allotropic forms, i.e. white (or yellow), red (or violet) and black
Elementary phosphorus exists in three principal allotropic forms, i.e. white (or yellow), red (or violet) and black

Answer 1

Correct option is B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Elemental phosphorus exists in several allotropic forms, the most common are white and red. White (or yellow) phosphorus is very reactive and will immediately inflame in the air so it is stored under water.

The other common form of phosphorus is red phosphorus which is much less reactive and is one of the components on the striking surface of a matchbox.