Which of the following is a homogeneous mixture?

• A. Salt water
• B. Iron filings and sulfur
• C. Sand and water
• D. Oil and water

Answer: (A)

Verified step by step guidance

1. Understand the definition of a homogeneous mixture: it is a mixture that has a uniform composition and appearance throughout, meaning you cannot distinguish the different components with the naked eye.
2. Analyze each option to determine if the components are evenly distributed at the microscopic level:
3. Salt water: Salt dissolves completely in water, forming a uniform solution where the salt particles are evenly distributed, making it homogeneous.
4. Iron filings and sulfur: These are two distinct solid substances mixed together but not dissolved, so you can see separate particles, making it heterogeneous.
5. Sand and water: Sand does not dissolve in water and settles at the bottom, so the mixture is not uniform and is heterogeneous.
6. Oil and water: Oil and water do not mix and form separate layers, so this is a heterogeneous mixture.