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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)
Correct Answer: (d) Combustion of Liquefied Petroleum Gas (LPG)
Explanation: Combustion is always a chemical change because a new compound is formed after burning and it is irreversible.
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