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Q.

Which of these is/ are irreversible change/s?


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a

      Melting of ice

b

      Melting of wax

c

      Boiling of water

d

      Burning of wax 

answer is D.

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Detailed Solution

Burning of wax is an irreversible change.
Irreversible changes are those changes which cannot be reversed in nature. The original substance cannot be obtained once a new substance is formed. The wax is being used up for burning, and this cannot be retained again. While burning, wax is combined with atmospheric oxygen and changes to carbon dioxide, heat, and light, a chemical change which is irreversible in nature.
 
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Which of these is/ are irreversible change/s?