Which of the following is an example of a solution?

• A. Oil and water mixture
• B. Ice cubes in water
• C. Salt water (NaCl dissolved in H2O)
• D. Sand and water mixture

Answer: (C)

Verified step by step guidance

1. Understand the definition of a solution: A solution is a homogeneous mixture where the solute is uniformly dissolved in the solvent at the molecular or ionic level.
2. Analyze each option to determine if it forms a homogeneous mixture:
3. 1. Oil and water mixture: Oil and water do not mix uniformly; they form separate layers, so this is a heterogeneous mixture, not a solution.
4. 2. Ice cubes in water: Ice cubes are solid pieces of water; this is a heterogeneous mixture because the solid and liquid phases are distinct.
5. 3. Salt water (NaCl dissolved in H2O): Salt dissolves completely in water, forming a uniform mixture at the molecular level, which is a classic example of a solution.
6. 4. Sand and water mixture: Sand does not dissolve in water and settles at the bottom, making it a heterogeneous mixture.