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Which of the following is/are true when milk changes into curd?

i) Its state changes from liquid to solid.
ii) Its color changes.
iii) It changes state.
iv) The change cannot be reversed.

A. (i) and (ii)
B. (i) and (iii)
C. (ii) and (iv)
D. (iii) and (iv)



Answer :

Final answer:

When milk changes into curd, it undergoes a state change from liquid to solid, may change color, and signifies a state change in the substance.


Explanation:

When milk changes into curd:

  1. Its state changes from liquid to solid: Milk transforms from a liquid state to a solid state during curdling due to the coagulation of proteins.
  2. Its changes color: The color change is possible as certain curd cultures may impart a different color to the milk during the curdling process.
  3. It changes state: The change from liquid to solid represents a state change in the substance.

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