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Q.

This is a natural change

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An Intiative by Sri Chaitanya

a

Making of ice

b

Rusting of iron

c

Electric bulb on and off

d

Rice to cooked rice

answer is A.

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Detailed Solution

Iron is rusted naturally in presence of moist air

4Fe+3O2+xH2O→2Fe2O3.xH2OHydrated ferric oxide rust 

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