Give two examples for each of the following cases:
(a) Physical changes which are reversible.
(b) Physical changes which are not reversible.
(c) Chemical changes.

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Solution

(a) The two examples of physical change that can be reversed are folding of paper and melting of ice.

(b) The two examples of physical change that cannot be reversed are tearing of paper and breaking of glass.

(c) The two examples of chemical changes are burning of wood and rusting of iron.

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