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Question

Which of the following change cannot be reversed?


A

Hardening of cement

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B

Freezing of ice cream

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C

Opening a door

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D

Melting of chocolate

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Solution

The correct option is A

Hardening of cement


Explanation for correct option:

(A) Hardening of cement

Irreversible changes

  • Irreversible changes are permanent changes.
  • Chemical changes are generally irreversible changes.
  • Examples are Cooking food and the formation of water from Hydrogen as well as oxygen.
  • The hardening of cement cannot be reversed as once hardened it cannot revert back into its original form.
  • During the hardening process cement undergoes a chemical process and sets into hard mass permanently which can not be reversed.

Explanation for incorrect options:

Reversible changes

  • Any changes which can be reversed or are a temporary conversion are known as Reversible changes.
  • Physical changes are generally reversible.
  • Examples of reversible changes are Melting, freezing, boiling water, etc

Thus, options B, C, and D are incorrect.

Hence, the correct option is A i.e. Hardening of cement.


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