Question

Which of the following are irreversible changes?

• A. Freezing of water
• B. Manufacturing of paper
• C. Burning of paper
• D. Baking a cake

Answer 1

Answer: (B), (C), (D)

The correct options are
B Manufacturing of paper
C Burning of paper
D Baking a cake

The changes in which the original state of an object can be re-obtained are reversible changes.
Whereas, the changes in which the original state cannot be re-obtained are irreversible changes.

Freezing of water is a reversible change as water can be changed again to its liquid state.

Others are irreversible change as wood cannot be obtained after manufacturing of paper, paper cannot be obtained after its burns and flour and other ingredients cannot be obtained after a cake is baked.