Which of the following is an example of a solution?

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

Answer: (B)

Verified step by step guidance

1. Understand the definition of a solution: A solution is a homogeneous mixture where one substance (the solute) is completely dissolved in another (the solvent), resulting in a single phase with uniform composition throughout.
2. Analyze each option to determine if it fits the definition of a solution:
3. 1. Ice cubes floating in water: This is a heterogeneous mixture because the ice (solid phase) and water (liquid phase) are distinct and not uniformly mixed.
4. 2. Salt water (NaCl dissolved in H2O): This is a classic example of a solution where salt (solute) is completely dissolved in water (solvent), forming a homogeneous mixture.
5. 3. Sand and water mixture: Sand does not dissolve in water, so this is a heterogeneous mixture with visible particles.
6. 4. Oil and water mixture: Oil and water are immiscible and form separate layers, making this a heterogeneous mixture.