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A small quantity of curd is added to warm milk. The milk is stirred and is set aside for a few hours at a warm place. In a few hours, the milk changes into curd. Which among the following statements is correct?
A Small Quantity Of Curd Is Added To Warm Milk. The Milk Is ...
Options:
A .  It is an irreversible change.
B .  It is a reversible change.
C .  It is a periodic change.
D .  It is a temporary change.
Answer: Option A
:
A
Changes which can't be reversed are called irreversible changes.
After curd is formed, it cannot be converted back to milk, because its chemical composition is changed during the process. So, this change is an irreversible change.

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