Maria examines a mixture that appears to be the same throughout. However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid. Which conclusion best fits her observations?

The mixture is a colloid because two different substances can be seen in a small sample when observed under a microscope.

Option D

Explanation:

Colloid is a heterogeneous mixture of two or more substances with relatively smaller size of solute particles and thus it appears to be a homogeneous mixture.

Particles present in a colloidal solution cannot be differentiated through naked eye observations and hence when Maria examined the sample under a microscope, two different substances were seen. Maria saw the mixture to be same throughout since the solute particles were very small in size and evenly dispersed in the solvent.