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Q12
(CISF/2024)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Which one of the following is an example of a physical change?
Result
Your answer:
—
·
Correct:
C
Explanation
A physical change is a process where the physical properties of a substance (such as its state, shape, or size) change, but its chemical identity remains the same. No new substances are formed, and the change is often reversible.
- Melting of ice: This is a physical change because it is merely a change of state from solid H2O to liquid H2O. The chemical composition remains unchanged, and it can be reversed by freezing.
- Ripening of banana: This is a chemical change involving enzymatic reactions that alter the chemical composition (converting starch to sugar).
- Souring of milk: This is a chemical change where bacteria convert lactose into lactic acid, creating a new substance.
- Passing CO2 gas into water: This is a chemical change because CO2 reacts with water to form a new chemical compound, carbonic acid (H2CO3).
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