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On what basis can the formation of curd from milk and the formation of ice from water be differentiated?

Answer and explanation

Correct answer: New substances are formed during curd formation, whereas ice formation involves only a change of state of water.

During curd formation, bacterial action produces new substances such as lactic acid and the properties of milk change; therefore, it is a chemical change. In contrast, when water freezes to form ice, its chemical composition remains \(\mathrm{H_2O}\); only its state changes, so it is a physical change. A colour change or precipitate formation is not an essential feature of either process.

Related tags

Chemical ReactionsChemical ChangePhysical ChangeCurd FormationChange Of StateClass 10 Science

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