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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.
(a) Physical changes which are reversible are:
(i) Folding of paper
(ii) Melting of ice
(b) Physical changes which are not reversible are:
(i) Cutting of paper
(ii) Breaking of glass
(c) Chemical changes are:
(i) Burning of paper
(ii) Curdling of milk
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