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Q.

Which of the following processes is/are a physical and reversible change/s?

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a

Heating of iron and sulphur

b

Melting of ice to form water

c

Weathering of rocks

d

Cooking of rice

answer is B.

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Detailed Solution

The melting of ice is a physical and reversible change.
Physical changes are changes in which no new substance is formed, and only physical properties change. They may or may not be reversible. The ice melts on heating and changes into water. This water on cooling changes into ice again. Here, no new substance is formed, only the state of water changes from solid to liquid. It is an irreversible change.

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