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Q.

Which of the following is a physical change?

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a

Burning of kerosene

b

Lightening of electric bulb

c

Heating sulphur with iron fillings to red hot state 

d

Heating sugar in a pan

answer is B.

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Detailed Solution

Lightening of electric bulb is a physical change.  When electric current is passed through the filament of a bulb the filament starts glowing.  It is a transfer of energy no new substance is formed, so it is a physical change. but burning of kerosene, heating sugar in a pan and heating sulphur with iron fillings to red hot state are chemical changes.

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