Which of these is not a chemical change?
(a) changing of ice to water
(b) changing of milk to curd
(c) rusting of iron
(d) both a and b

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Solution

Changing of ice to water is a physical change.

Hence, the correct answer is option a.

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Rusting of iron is both chemical and physical change . Why?

	I		II
(a)	Physical change	(i)	Curdling of milk
(b)	Chemical change	(ii)	Demagnetisation of magnets
		(iii)	Digestion of food
		(iv)	Crystallisation of substance
		(v)	Rusting of iron

Give reason:

(a)Freezing of water to ice and evaporation of water are physical changes.

(b)Burning of a candle is both a physical and a chemical change.

(c)Burning of paper is a chemical change.

(d)Cutting of a cloth piece is a physical change, though it cannot be reversed.

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