Which of the following is a temporary change?

Condensation of water vapour

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Bud turning into flower

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Rusting of iron

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Cutting of paper

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Solution

The correct option is A
Condensation of water vapour
During condensation, there is a change of state from water vapour (gaseous state) to liquid water (liquid state). Condensation is a temporary change because we can get back the water vapour by evaporating the liquid water.
Bud turning into flower, rusting of iron and cutting of paper are permanent changes as we cannot get back the flower, iron and paper in the original form.

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(i) No new substance is formed.
(ii) The change is reversible
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(i) No new substance is formed.
(ii) The change is reversible
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