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Physical and Chemical Changes

Which among t...

Question

Which among the following is not a physical change ?

A

Melting of solids to liquids

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B

Vaporisation of liquids to gasses

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C

Liquefaction of gasses to liquids

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D

Decay of matter

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Solution

The correct option is D Decay of matter
Melting, vapourisation and liquification all are pure physical changes where the chemical composition of the material does not change. But during the decay of matter, there occurs a permanent chemical change catalysed by living organism. So the correct option is D

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Match the following.

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(a)	Melting point	1.	Thermometer
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Q. Question 1

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)

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