Which of the following is a chemical change?

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Burning of a fire cracker

Germination of seed

All of these

Coal formation from burried trees

answer is D.

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Detailed Solution

a) Burning of fire cracker is a chemical change. It produces heat, light & sound and it is irreversible.

b) Germination of seed is a chemical change because in chemical change new substance will be formed. Seeds grows into a plant or tree and the character’s and appearance changes.

c) Coal formation is a chemical change, coal is a fossil fuel. It is formed by dead remains of living organisms. It takes millions of years to form. It is entirely a new substance.

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