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. A chemical change results in the formation of new chemical substances with different properties, while a physical change alters the form but not the chemical composition. 2. Statement 1: Crystallization of sodium chloride involves changing dissolved sodium chloride (NaCl) into solid crystals. The chemical substance remains NaCl. This is a physical change. 3. Statement 2: Melting of ice involves the change of state of water from solid (H2O) to liquid (H2O). The chemical substance remains water. This is a physical change. 4. Statement 3: Souring of milk involves bacterial fermentation where lactose (milk sugar) is converted into lactic acid. This process forms new chemical substances and alters the milk's composition and properties (taste, acidity). This is a chemical change. Therefore, only the souring of milk is an example of a chemical change.