Question

which is an example of a colloid?
a salad dressing
b sugar and water
c salt water
d homogenized milk

Explanation:

To determine the colloid, we analyze each option:

• Option a (salad dressing): Often a suspension (particles settle).
• Option b (sugar and water): Forms a true solution (sugar dissolves completely).
• Option c (salt water): Also a true solution (salt ions disperse).
• Option d (homogenized milk): Is a colloid, where fat globules are dispersed in water (liquid - liquid colloid, emulsion) and do not settle.

Answer:

d. homogenized milk