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Why is the conversion of milk into curd a chemical change?

Answer and explanation

Correct answer: A new substance, curd, with properties different from milk is formed

During curd formation, bacteria convert lactose in milk into lactic acid. The lactic acid coagulates casein protein, forming curd with properties different from those of milk. Because new substances are formed, this is a chemical change. In contrast, separation of fat is only a physical separation of components of a mixture and does not form a new substance.

Related tags

Class 10 ScienceChemical ReactionsChemical ChangeCurd FormationLactic AcidCasein Coagulation

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