Question

which of the following is a heterogeneous mixture?
a. gold alloy
b. rubbing alcohol
c. saltwater
d. paint

Explanation:

A heterogeneous mixture has non - uniform composition. A gold alloy (A) is a homogeneous mixture (solid solution). Rubbing alcohol (B) is a homogeneous mixture of isopropyl alcohol and water. Saltwater (C) is a homogeneous mixture of salt and water. Paint (D) has visible particles (like pigment particles) dispersed unevenly, so it's a heterogeneous mixture.

Answer:

D. Paint