Final answer:
From the list given, air is the homogeneous mixture, as it is a uniform mixture of gases like nitrogen and oxygen.
Step-by-step explanation:
To identify the homogeneous mixture from the list provided, we need to understand what a homogeneous mixture is. A homogeneous mixture, also known as a solution, has a uniform composition throughout and appears the same visually. Examples of homogeneous mixtures include air, maple syrup, and a saltwater solution.
- a. Cola: Although it appears uniform, cola is actually a heterogeneous mixture due to the presence of carbonation and other undissolved particles.
- b. Air: This is a homogeneous mixture of various gases such as nitrogen, oxygen, and argon, which are thoroughly mixed.
- c. Concrete: Concrete is a heterogeneous mixture of cement, sand, aggregates, and water.
- d. Trail mix: Clearly a heterogeneous mixture as the nuts, raisins, and chocolates can be seen as separate components.
- e. Blood: Blood may seem like a homogeneous mixture because of its uniform appearance, but it's actually heterogeneous due to the presence of cells and plasma which can be separated.
Therefore, the homogeneous mixture from the list is b. Air.