Answer:
Option (d) is the correct response. Wax changes its physical state but not its characteristics when heated, therefore there is no chemical change but there is a physical change.
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 (d) Melting of candle wax on heating
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 (d) Melting of candle wax on heating