Question

Which of the following are homogeneous in nature?
(i) Ice (ii) Wood (iii) Soil (iv) Air

• A. (i) and (iii)
• B. (ii) and (iv)
• C. (i) and (iv)
• D. (iii) and (iv)

Answer 1

Answer: (C)

(i) and (iv)

Ice is solid with the same composition of a water molecule.

Wood consists of cells, and the cell walls are composed of microfibrils of cellulose (40% to 50%) and hemicellulose (15% to 25%) impregnated with lignin (15% to 30%). Thus, it is heterogeneous in nature.

Soil is a heterogeneous mixture. Soil is made up of a variety of substances, such as pebbles, plant matter and sand, but these components remain separate in the mixture.

Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances.
Hence, option C is correct.