Which type of mixture is classified as a solution?

• A. A heterogeneous mixture that separates into distinct phases on standing
• B. A pure substance consisting of only one type of atom
• C. A homogeneous mixture with uniform composition throughout
• D. A mixture in which one substance completely reacts to form a new compound

Answer: (C)

Verified step by step guidance

1. Understand the definition of a solution: it is a homogeneous mixture where the composition is uniform throughout the sample.
2. Recognize that a heterogeneous mixture has visibly different phases or parts and does not have uniform composition, so it is not a solution.
3. Recall that a pure substance consists of only one type of atom or molecule and is not a mixture, so it cannot be classified as a solution.
4. Identify that a mixture where substances chemically react to form a new compound is a chemical reaction product, not a solution.
5. Conclude that the correct classification for a solution is a homogeneous mixture with uniform composition throughout.