Phosphorus is highly inflammable; in a matchstick, it ignites by ___ .

It sublimes.

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It turns into a liquid.

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It changes wood into a fuel.

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It starts burning.

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Solution

The correct option is D
It starts burning.

When you strike the stick against the striking surface, the friction hence generated causes some of the red phosphorus present to turn into white phosphorus. It ignites spontaneously in the air. Thus, we can say that in a matchstick, phosphorus ignites by heat energy generated by friction.

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Fill in the following blanks with suitable words :

(a) A fuel must be heated to its___ before it starts burning.

(b) The most common supporter of combustion around us is___

(d) A liquid fuel used in homes is___

(e) The amount of heat evolved when 1 kg of a fuel is burnt completely is called its___

(f) The substances which vaporise during burning, give___

(g) Burning of wood and coal causes___ of air.

Can you burn a piece of wood by bringing a lighted matchstick near it ? Explain.

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