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Q: Which of the following is not a physical change?
  • A. Melting of solids into liquids
  • B. Liquefaction of gases into liquids
  • C. Fermentation of substances
  • D. Evaporation of liquids in gases
Correct Answer: Option C - Fermentation of substances is not physical change. It is a chemical change. For example- making curd from milk, making vinegar from sugarcane juice etc.
C. Fermentation of substances is not physical change. It is a chemical change. For example- making curd from milk, making vinegar from sugarcane juice etc.

Explanations:

Fermentation of substances is not physical change. It is a chemical change. For example- making curd from milk, making vinegar from sugarcane juice etc.