What are reversible and irreversible changes? Give one example for each.

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Solution

Reversible change : When a change in a substance can be reversed by changing the conditions, it is said to be a reversible change. Example : Melting of ghee or wax.

Irreversible change : When a substance can not be brought back to its original state after a change, it is said to be an irreversible change. Example : Souring of milk.

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Question 1:

Four students have their own opinion about reversible and irreversible changes. Who among the following is correct?

Rohan: Both physical and chemical changes are reversible.

Sam: Both physical and chemical changes are irreversible.

Tom: Physical changes are irreversible and chemical changes are reversible.

Riah: Chemical changes are irreversible and physical changes are reversible

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