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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

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(a) Evaporation of petrol is a physical change because no new chemical cubstance is formed.
(b) Burning of LPG is a chemical change because on burning, LPG forms `CO_(2) and H_(2)O`.
`(c)`Heating of an iron rod to red hot is a physical change.
(d) Curdling of milk is a chemical change because in the conversion of milk to curd, new chemical susbtances are formed.
(e) It is a physical change, because solid `NH_(4)Cl` vapours and no new chemical substance is formed.
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