Question

For which one of the following mixtures is composition uniform throughout?

• A. Sand and water
• B. Grains and pulses with stone
• C. Mixture of oil and water
• D. Dilute aqueous solution of sugar

Answer 1

The Correct Option is D

A homogeneous mixture is a mixture in which the composition is uniform throughout, meaning that the components are evenly distributed.

• (A) Sand and water: This is a heterogeneous mixture. Sand and water do not form a uniform mixture. Sand particles do not dissolve in water and settle down over time.
• (B) Grains and pulses with stone: This is also a heterogeneous mixture because the components (grains, pulses, and stones) are easily distinguishable and are not uniformly mixed.
• (C) Mixture of oil and water: This is another heterogeneous mixture. Oil and water do not mix uniformly; they form separate layers due to differences in polarity.
• (D) Dilute aqueous solution of sugar: This is a homogeneous mixture. In a dilute solution of sugar and water, the sugar dissolves completely and is uniformly distributed in the water, making it a uniform solution.

Thus, the correct answer is (D) Dilute aqueous solution of sugar because it is a homogeneous mixture with a uniform composition throughout.

Answer 2

A uniform mixture means that the composition of the mixture is the same throughout, and the components are evenly distributed at the molecular level.

• Sand and water: This is a heterogeneous mixture where the sand particles are not dissolved in water and settle down. The composition is not uniform throughout the mixture.
• Grains and pulses with stone: This is another example of a heterogeneous mixture, where stones and grains are physically separated. The composition is not uniform.
• Mixture of oil and water: This is also a heterogeneous mixture, as oil and water do not mix uniformly. Oil forms droplets and does not dissolve in water, leading to a non-uniform composition.
• Dilute aqueous solution of sugar: This is a homogeneous mixture because the sugar completely dissolves in water, and the composition is uniform throughout the solution. The molecules of sugar are evenly distributed in the water.