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Question


The given image shows of a matchstick.

A
burning
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B
heating
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C
melting
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Solution

The correct option is A burning
The image shows a burning matchstick. When a substance is heated, its temperature increases. After reaching a particular temperature in the presence of oxygen, the substance catches fire and starts burning. This temperature is called as ignition temperature.

Similarly, when a matchstick is heated in the presence of oxygen, above its ignition temperature it catches fire and starts burning. During this process gases like CO2 are released along with the formation of ash. This is a chemical change and it is irreversible unlike heating.

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