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.
The hardening of cement bags due to water is not a reversible change. Rather it is an irreversible change because the cement on getting wet by water and then comes in contact with sunlight, get hardened and acquires a permanent shape which cannot be reversed back to cement powder; hence it is an irreversible change. A reversible change is one in which no new product is formed, and we can get back the initial product from the final product so formed. Irreversible change is the change in which there is the formation of a new substance with completely different properties, and it cannot be reversed back to get the initial product.
The correct statement would be that the hardening of cement bags due to water is an irreversible change.

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