When milk is converted into curd, which type of change is it?

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SSC CHSL Exam 2023 Tier-I Official Paper (Held On: 09 Aug, 2023 Shift 4)
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  1. Reversible change
  2. Physical change
  3. Isothermal change
  4. Chemical change

Answer (Detailed Solution Below)

Option 4 : Chemical change
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SSC CHSL Exam 2023 Tier-I Official Paper (Held On: 02 Aug 2023 Shift 1)
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Detailed Solution

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The correct answer is Chemical Change.

Key Points

  • Chemical change:-
    • This type of change alters the composition of the substance and results in the formation of a new substance. Examples include combustion, rusting, and digestion. When milk is converted into curd, it undergoes a chemical change.
    • This change is irreversible, meaning it cannot be undone.
    • The process of converting milk into curd is called fermentation, which is a chemical reaction that occurs due to the presence of bacteria.
    • During fermentation, the lactose in the milk is converted into lactic acid, which causes the milk to thicken and form curd.

Additional Information

  • Reversible change:
    • This type of change can be undone, meaning the original substance can be restored. Examples include melting and freezing of ice.
  • Physical change:
    • This type of change does not alter the composition of the substance. Examples include changes in state (solid, liquid, gas) and changes in shape or size.
  • Isothermal change:
    • This type of change occurs at a constant temperature and does not involve any change in energy.
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