Final answer:
A homogeneous mixture, also known as a solution, looks smooth and the same throughout. It has a uniform composition and properties. So, option a) is correct among the other options.
Step-by-step explanation:
A homogeneous mixture is one in which the components are uniformly distributed, resulting in a single phase with a consistent composition throughout. This means that, at a microscopic level, the substances are evenly mixed, making it difficult to distinguish between the individual components. Examples of homogeneous mixtures include saltwater and air. In contrast, a heterogeneous mixture consists of visibly different substances or phases, such as oil and water.
Options c) Homogeneous in suspension and d) Heterogeneous in suspension imply the presence of particles suspended in a liquid, but the key difference lies in the uniformity of distribution. Homogeneous in suspension suggests even distribution, while Heterogeneous in suspension indicates uneven distribution, leading to visible differences in the mixture. Therefore, option a) Homogeneous is the correct answer for a mixture that looks smooth and the same throughout due to its uniform composition at both macroscopic and microscopic levels.