Which of the following is not a physical change ?

Question:

Which of the following is not a physical change ?

(a) Boiling of water to give water vapours

(b) Melting of ice to give water

(c) Dissolution of salt in water

(d) Combustion of Liquefied Petroleum Gas (LPG)

Solution:

(d). LPG is a mixture of gases like propane (C3Hg) and butane (C4H10) in liquefied form. These are chemical substances and undergo combustion

upon heating with air or oxygen. It is therefore, a chemical change.

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