Match the articles in column I with column II.

Matrix:

Column I

Column II
a)
Cutting of trees
Melting of butter in a pan
Boiling of water to form steam
Dissolving common salt in water
Making a fruit salad with raw fruits
i)

Chemical changes
b)
Rusting of almirah
Passing of electric current through water and breaking down water into hydrogen and oxygen gases
Burning of paper and wood
ii)

Physical changes

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a – i; b – ii

a – ii; b – i

a – i; b – i

a – ii; b – ii

answer is B.

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Detailed Solution

The cuttings of trees, melting of butter, boiling of water, dissolving of common salt in water and making a fruit salad are all physical changes. No new substances are formed and any substance's chemical composition does not change. They may or may not be reversible. Almirah's rusting, electric current's passing to break down water, and burning paper and wood are all chemical changes. The chemical properties of the substances changes and a new substance are formed as the chemical properties of the substances are altered. They cannot be reversed.

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