Which of the following is NOT a physical change?
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A.
Liquefaction of gases to liquids
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B.
Fermentation of substances
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C.
Vaporisation of liquids to gases
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D.
Melting of solids to liquids
Correct Answer:
B. Fermentation of substances
Explanation:
The correct answer is fermentation of substances. While liquefaction, vaporization, and melting are physical changes involving transitions between states of matter without altering molecular composition, fermentation is a chemical change. During fermentation, microorganisms like bacteria or yeast enzymatically break down organic compounds, such as sugars, to create entirely new substances like acids, alcohols, or gases. This process involves the breaking and forming of chemical bonds, making it an irreversible transformation that alters the chemical identity of the material.
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