Question : When milk is converted into curd, which type of change is it?
Option 1: Reversible change
Option 2: Physical change
Option 3: Isothermal change
Option 4: Chemical change
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Correct Answer: Chemical change
Solution : The correct option is Chemical change .
When milk is converted into curd, it is a chemical change. This transformation involves the fermentation of milk by beneficial bacteria, such as Lactobacillus, which consume the lactose (milk sugar) and produce lactic acid. The production of lactic acid changes the composition and properties of the milk, giving it a thicker texture and a sour taste, which are characteristic of curd or yoghurt. This chemical change is irreversible, as you cannot easily revert curd into milk with the same properties it had before the transformation.
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