Which of them will undergo a chemical change?
A) Eggs
B) Plastic bottle
C) Both eggs and moth balls
D) Eggs, plastic bottle and moth balls
Correct Answer: A
Solution :
The bacteria present in air break down the proteins in the egg whites and hydrogen sulphide gas is produced which gives a 'rotten egg? smell. As the change is permanent and irreversible, it is a chemical change. Plastic bottle does not show any change. The moth balls (naphthalene) sublime at room temperature. It is a physical change.
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