Which of the following does not involve a chemical reaction?
- Process of respiration
- Digestion of food in our body
- Burning of candle wax when heated
- Melting of candle wax on heating
Answer
- Melting of candle wax on heating
Explanation : Melting of wax involves a change in state from solid to liquid only and no chemical change is involved. Since only physical reaction is involved, it is not a chemical reaction.
However burning of candle is a chemical change as combustion reaction takes place in oxygen with production of Carbon Dioxide and water
