How does curd set? Is this change reversible? - Vidyadip

Question

How does curd set? Is this change reversible?

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Answer

A small quantity of curd is added to warm milk. The milk is stirred and is set aside undisturbed for a few hours at a warm place. In a few hours, the milk changes into curd.
Curd formed from milk cannot be changed into milk again. So, this is an irreversible change.

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