Which of the following does not involve a chemical reaction?

  1. Process of respiration
  2. Digestion of food in our body
  3. Burning of candle wax when heated
  4. Melting of candle wax on heating



  1. Melting of candle wax on heating

MELTING OF WAX - Teachoo.jpg

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

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo