Question

9. Changing of milk into curd is a:
(a) physical change
(c) chemical change
(b) fast change
(d) reversible change​

Answer 1

Answer:

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Explanation:

Hence it is not a physical or chemical property of milk. A physical change is usually reversible and chemical change is not. After milk is converted into curd, the change is not reversible since the acidity of the medium in which the casein coagulates cannot be reversed.

Answer 2

Answer:

chemical change because milk is now converted into lactic acid which cannot be reversed