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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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Q. Which among the following is not a physical state of matter?

Q. Assertion :The burning of a candle is both a physical and a chemical change. Reason: Burning of candle melts the wax and hence physical state of wax has changed from solid to liquid. Again the wax combines with the atmosphere oxygen and changes to carbon dioxide, heat and light.

Match the following.

Group ‘A’		Group ‘B’
(a)	Melting point	1.	Thermometer
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		5.	Unit of heat

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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Physical and Chemical Changes

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