Question

1) Which of the following does not classify as a physical change?
(a)Stretching of a rubber band
(b)Dissolving sugar in water
(c) Setting curd from milk
(d) Melting of an ice cube​

Answer 1

Answer:

Option D

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Answer 2

(c) Setting curd from milk does not classify as physical change.

1. Physical changes do not result in formation of new product. Only their form changes.
2. Moreover, original form of product can be obtained making them reversible in nature.
3. Setting curd from milk involves chemical change as lactose converts into lactic acid, which further reacts with casein protein.
4. In dissolving sugar in water, the identity of sugar molecules remains intact, hence it is also a physical change.