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Question
Which of the following is true with the conversion of milk to curd?
Options:
A .  It is a physical change.
B .  It is a reversible change.
C .  It involves changes in chemical composition.
D .  It is a chemical change and a reversible change.
Answer: Option C
:
C
Turning milk into curd is a chemical change. A chemical change is defined as a change in which composition of substancechanges. The compositions of curd and milk are different. After converting milk into curd, we cannot get back the milk again. So, it is anirreversible change.

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