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.
1 and 2 only
3 only
1, 2 and 3
None
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Answer is Wrong!
This question was previously asked in
UPSC IAS – 2014
2. Melting of ice: This is a change of state from solid water (ice) to liquid water. It is a physical change because the substance is still water (H₂O), just in a different form.
3. Souring of milk: This occurs when bacteria convert lactose (milk sugar) into lactic acid. This process creates new chemical substances (lactic acid) and changes the milk’s properties (taste, smell, texture). This is a chemical change.