GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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PHYSICAL SCIENCE Multiple Choice Which of the following is a chemical reaction?
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W) Evaporating rubbing alcohol
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X) Burning lamp oil
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Y) Dissolving table salt in water
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Z) Forming frost
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Explanation:
Detailed explanation-1: -The process of burning (as opposed to evaporating) is a chemical reaction, a chemical change. The wax molecules are undergoing a chemical change; they are changing into different molecules by reacting with a substance in the air.
Detailed explanation-2: -Growth of a plant, rusting of iron, cooking of food, digestion of food, and burning of a candle are chemical changes because the chemical composition of the substance changes.
Detailed explanation-3: -Burning of a fuel is a chemical change. This is because, burning of any substances results in the production of heat, light and other products.
There is 1 question to complete.