Which of the following is not a chemical change?

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Burning of wood

Cutting of wood

Explosion of crackers

Spoilage of food

answer is B.

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Detailed Solution

A change in which one or more new substances are formed is called a chemical change.
A chemical change is also called a chemical reaction.
In the burning of wood, carbon dioxide and ash are formed which are completely new substances. Also, heat and light are produced. So it is a chemical change.
In the explosion of crackers, a chemical reaction takes place. The explosion produces heat, light, sound, and unpleasant gases that pollute the atmosphere. So it is a chemical change.
In spoilage of food, decomposition of food takes place which leads to the formation of products that are different from the original food. Also, a foul odour is produced. So it is a chemical change.
In the cutting of wood, no new substance is formed. No chemical reaction takes place. So it is an example of physical change.

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