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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

  1. a: ii, iv; b: i, iii, v
  2. a: iii, v; b: i, ii, iv
  3. a: i, ii, iii; b: iv, v
  4. a: ii, iv; b: i, iii, iv

A
a: ii, iv; b: i, iii, v
B
a: iii, v; b: i, ii, iv
C
a: ii, iv; b: i, iii, iv
D
a: i, ii, iii; b: iv, v
Solution
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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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