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Homogeneous Mixture

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Question

How can it be that when we right on a paper so it is a irreversible change?? We can easily rub it with a rubber and it can again be the same so it is a reversible change

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Solution

Writing on a paper with pencil or pen is physical change because no products are formed. The pencil writting is reversible while writting with pen is reversible or irreversible.

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