Question

Which of the following undergoes spontaneous combustion?
A. yellow sulphur
B. red phosphorus
C. white phosphorus
D. brown sulphur

Answer 1

White phosphorus


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Answer 2

C. white phosphorus

Explanation:

In early days, white phosphorous was used in the manufacture of matchsticks. When struck against a rough surface, white phosphorus gets ignited due to heat of friction. This started the combustion of the mixture. White phosphorous is capable of spontaneous combustion, so it is dangerous. So, it is no longer used these days.

Spontaneous combustion is the phenomenon in which a substance unexpectedly bursts into flame without apparent cause. There is no external source of heat or fire involved

Option C is the answer.