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
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Evaporation of petrol and heating of iron rod are physical changes since new substances are not being formed. Burning of LPG and curdling of milk are chemical changes as the original substances are changing to new substances.