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Which of the following is/are the example/examples of chemical change

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.(2014)

a) 1 and 2 only

b) 3 only

c) 1, 2 and 3

d) None

ANswer: B

Chemical changes occur when a substance combines with another to form a new substance. Crystallization of sodium chloride is not a chemical as water of crystallization can be lost to get salt again . Similarly melting of ice is reversible .However souring of milk is a chemical change as it is not reversible and a new compound is formed.


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