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Q.

Which of the following does not involve a chemical reaction

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a

Melting of candle wax on heating

b

Burning of candle wax when heated

c

Digestion of food in our body

d

Process of respiration

answer is D.

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Detailed Solution

Melting of wax does not give rise to new products. When the temperature decreases, the wax solidifies again.

Because in physical change no new product is formed. 

 

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Which of the following does not involve a chemical reaction