Which one of the following does not involve a chemical reaction?
(a) Digestion of food in our body
(b) Process of respiration
(c) Burning of candle wax when heated
Melting of candle wax on heating

Question

Which one of the following does not involve a chemical reaction?
(a)	Digestion of food in our body
(b)	Process of respiration
(c)	Burning of candle wax when heated
Melting of candle wax on heating

Accepted Answer

Option (d) is the answer. Wax changes its physical state on heating but not the properties so it does not involve any chemical change but involves physical change

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