Filtration, or screening, is one way to separate certain mixtures, as shown in the image. Which of these mixtures could be most easily separated by filtration?

Question

Responses

A oil and wateroil and water
B dissolved sugar and waterdissolved sugar and water
C sugar and saltsugar and salt
D flour and marbles

Answer 1

The mixture that could be most easily separated by filtration is:

D. flour and marbles

In this mixture, flour (a fine solid) can pass through a filter paper, while the marbles (larger solid objects) will be retained by the filter. The other options involve either liquids that can mix (A) or dissolved substances (B and C) that cannot be separated by filtration.