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Which among the following are physical o...

Which among the following are physical or chemical changes?
(a) Evaporation of petrol
(b) Burning of Liquefied Petroleum Gas (LPG)
`(c)`Heating of an iron rod to red hot
(d) Curdling of milk
`(e)`Sublimation of solid ammonium chloride

Text Solution

Verified by Experts

Physical change : (a), (c) and (e )
Chemical change : (b) and (d)
Explanation : Changes which are temporary with no new substance being formed, are known as physical changes.
Change in which one or more new substances are formed is known as chemical change.
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Classify the following as physical and chemical changes. (i) Conversion of milk into curd (ii) Burning of magnesium ribbon in air (iii) Rusting of iron nails (iv) Dissolving salt in water (v) Burning of cool (vi) Electrolysis of sodium chloride solution by passing current (vii) Crystallisation of copper sulphate.

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