Question

Match the columns:

III
(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

A

a: i, ii, iii;       b: iv, v

B

a: ii, iv;          b: i, iii, iv

C

a: ii, iv;          b: i, iii, v

D

a: iii, v;          b: i, ii, iv

Medium

Solution

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Correct option is
C

a: ii, iv;          b: i, iii, v

A change in which only the physical properties of the substance are changed, while its chemical composition remains unchanged, is called a physical change. Crystallisation of substance and demagnetisation of magnets come under this change.

A change in which chemical composition and chemical properties of the reacting substances undergo a change is called a chemical change.
For eg., curdling of milk, digestion of food, rusting of iron

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