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.
Asked in UPSC IAS 2014 · Topic: Physical and Chemical Changes, Solution (Distinction between Physical and Chemical Changes)
More Chemistry questions
- Crystallization of sodium chloride: This is a process where dissolved salt precipitates out of a solution as crystals. It is a physical change because the chemical composition (NaCl) remains the same. 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. 140. Which one of the following statements about air is correct ?
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