Question
Which of the following is/are the example/examples of chemical change?
1. Crystallization of sodium chloride
2. Melting of ice
3. Souring of milk
Select the correct answer using the code given below.
(a) 1 and 2 only
(b) 3 only
(c) 1, 2 and 3
(d) None
Answer:
B
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Explanation:
Among the given options, souring of milk is the only example of a chemical change. Souring of milk involves the conversion of lactose (a sugar) into lactic acid by the action of bacteria. This chemical reaction changes the composition and properties of the milk, making it sour.
Crystallization of sodium chloride and melting of ice, on the other hand, are physical changes. Crystallization involves the formation of a crystal structure without any change in the chemical composition, while melting is the change of state from solid to liquid without any chemical reactions.