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

Hint:

A sugar solution is a homogeneous mixture with uniform distribution.

Answer 1

The Correct Option is D

To determine which mixture has a uniform composition throughout, we need to understand the concept of homogeneous and heterogeneous mixtures in chemistry.

A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. The different components of the mixture are not distinguishable. On the other hand, a heterogeneous mixture has a non-uniform composition, and its constituent components are distinguishable.

Let's analyze each option to identify the correct answer:

1. Sand and water: This is a heterogeneous mixture because sand particles do not dissolve in water and can be seen separately. The composition is not uniform throughout.
2. Grains and pulses with stone: This mixture is heterogeneous because stones can be distinguished from grains and pulses. The composition is visibly non-uniform.
3. Mixture of oil and water: Oil does not dissolve in water, leading to two distinct layers. This is a heterogeneous mixture because of the clearly visible separation of components.
4. Dilute aqueous solution of sugar: Once sugar dissolves in water, the mixture is homogeneous. The sugar molecules are evenly distributed throughout the water, making the composition uniform throughout the solution.

Based on the above explanations, the correct answer is the dilute aqueous solution of sugar, as it is the only homogeneous mixture among the options provided.