In what type of mixture are the components visible and easily separated?

A heterogeneous mixture is characterized by the presence of visibly distinct components that can be easily observed and separated. This type of mixture consists of different substances that do not blend uniformly. Common examples include salads, sandy water, or even a mixture of oil and vinegar, where you can see the different parts and separate them physically, such as by filtration or by hand.

In contrast, a colloidal mixture comprises small particles that remain dispersed throughout a medium but do not settle on standing, making them less visible to the naked eye. Homogeneous mixtures, or solutions, are those where the components are fully blended and appear uniform throughout. The individual substances cannot be distinguished or easily separated from one another.

Therefore, the defining trait of a heterogeneous mixture is the distinct visibility and separability of its components, making it the correct choice for the question.