Question

Sugar and Salt solutions are:

• A. Heterogeneous mixtures
• B. True solutions
• C. Colloidal solutions
• D. Suspensions

Hint:

True solutions are homogeneous mixtures where the solute is completely dissolved in the solvent, and particles are not visible.

Answer 1

The Correct Option is B

Sugar and salt solutions are categorized as true solutions.

In chemistry, a true solution is a homogeneous mixture where the solute (like sugar or salt) is completely dissolved in the solvent (typically water) at the molecular level. This results in a clear, uniform mixture where the solute particles are not visible to the naked eye and do not settle upon standing. The key characteristics of true solutions include:

• Homogeneity: The composition is uniform throughout the solution.
• Particle Size: The particles of the solute are very small, less than 1 nanometer in diameter, which allows them to completely dissolve in the solvent.
• Visibility: The particles are not visible under a microscope.
• Stability: The solution is stable, and the solute does not settle out over time.
• Filterability: True solutions pass through ordinary filter paper without leaving a residue.

These characteristics distinguish true solutions from heterogeneous mixtures, colloidal solutions, and suspensions, where the phases are either visibly distinct, or the particles differ in size and behavior.

Answer 2

Sugar and salt solutions are being classified here. Check each option against how these solutions actually look and behave.

1. Heterogeneous mixtures: a heterogeneous mixture has visibly different parts or regions. A sugar or salt solution looks completely uniform throughout, so it is not heterogeneous.
2. True solutions: once sugar or salt fully dissolves, the mixture is clear, uniform throughout, does not scatter light, and never settles out on standing. This is exactly how true solutions behave.
3. Colloidal solutions: a colloid scatters light and holds particles that never fully dissolve. A dissolved sugar or salt solution does not scatter light this way.
4. Suspensions: a suspension has visible undissolved particles that settle over time. Sugar and salt, once dissolved, leave nothing to settle.

Dissolved sugar and salt form clear, uniform mixtures with no settling or light scattering, which is the behavior of a true solution.

So the correct answer is true solutions.