. Which of the following does not involve a chemical reaction


A: Process of respiration

B: Digestion of food in our body

C: Burning of candle wax when heated

D: Melting of candle wax on heating

 

Best Answer

Explanation :

The correct answer is option D i.e melting of wax does not involve a chemical reaction and is just a physical reaction. 

This is because melting of wax involves a change in physical state from solid to liquid only and there is no

chemical change involved or in other words no chemically different product is formed during the process. 

Meanwhile digestion of food involves breakdown of larger polymeric units into smaller absorbable forms,

burning of candle leads to irreversible change and production of CO2 as well as H2O and respiration involves oxidation of

substrate into products depending on pathway involved. Thus, all of options A, B  and C involve chemical changes. 

Final Answer:

Hence, the correct answer is option D i.e. melting of candle wax on heating involves only physical reaction and certainly no chemical reaction. 

 

 

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