Question

Which of the following is not used in making matchsticks these days?
A. potassium chlorate
B. white phosphorus
C. antimony tri sulphide
D. red phosphorus

Answer 1

White phosphorus


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Answer 2

B. 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. Only potassium chlorate and antimony trichloride are used in matchsticks nowadays.

Option B is the answer.