Which of the following is not a physical change?(a) Boiling of water to give water vapour(b) Melting of ice to give water(c) Dissolution of salt in water(d) Combustion of Liquefied Petroleum Gas (LPG)
Question
Which of the following is not a physical change?(a) Boiling of water to give water vapour(b) Melting of ice to give water(c) Dissolution of salt in water(d) Combustion of Liquefied Petroleum Gas (LPG)
Solution
The answer is (d) Combustion of Liquefied Petroleum Gas (LPG). This is not a physical change, but a chemical change. In a physical change, the form of matter is altered but one substance is not transformed into another. The changes of state (like boiling or melting), and dissolving one substance into another, are examples of physical changes. In contrast, a chemical change results in one or more substances of entirely different composition from the original substances. The combustion of LPG is a chemical change because it results in the production of water vapor and carbon dioxide, which are different substances from the original LPG.
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