Question : Which of the following is not a chemical reaction?
Option 1: Burning of paper
Option 2: Digestion of food
Option 3: Conversion of water into steam
Option 4: Burning of coal
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Correct Answer: Conversion of water into steam
Solution : The correct option is the Conversion of water into steam.
The conversion of water into steam is a physical reaction because it involves the state of matter without altering the chemical composition of water molecules. Heat energy is applied to water, causing it to transition from liquid to gaseous state without forming new substances.
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