Is it true that the hardening of cement bags due to water is a reversible change?

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True

False

answer is B.

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Detailed Solution

The above statement is false.
Irreversible changes are those changes that we cannot reverse once they occur. They are chemical changes, and in this change, the property of the substance changes completely, and it cannot be reverted as milk turned into curd is an example of irreversible changes.
When any substance changes, there is a change in the properties of the substance, and when it can again revert these changes, it is known as a reversible change, like the melting of ice.
Hardening of cement bag due to water is not a reversible change rather it is an irreversible change because the cement on getting wetted by water and then coming in contact with sunlight gets harden and acquire permanent shape which cannot be reversed back to cement powder and hence it is an irreversible change.
The correct statement would be – hardening of cement bags is an irreversible change.

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