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Question
Assertion

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

Reason

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

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C

Assertion is correct but Reason is incorrect

D

Both Assertion and Reason are incorrect

Medium

Solution

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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.

Video Explanation

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