When a solid is stirred into a liquid and dissolves completely, which type of mixture is formed?

• A. Colloid
• B. Emulsion
• C. Suspension
• D. Solution

Answer: (D)

Verified step by step guidance

1. Understand the definitions of the different types of mixtures: a solution, a colloid, an emulsion, and a suspension.
2. A solution is a homogeneous mixture where the solute dissolves completely in the solvent, resulting in a single phase with uniform composition.
3. A colloid is a mixture where particles are dispersed throughout but are not dissolved; the particles are larger than in a solution but do not settle out.
4. An emulsion is a type of colloid where two immiscible liquids are mixed, such as oil and water, with one dispersed in the other.
5. A suspension is a heterogeneous mixture where solid particles are dispersed in a liquid but are large enough to eventually settle out over time.
6. Since the problem states the solid dissolves completely in the liquid, the mixture formed is a solution, which is homogeneous and stable.