Question

$A_1,A_2$-identical molecules
B,C-different molecules
$D_1,D_2$-molecules on a liquid surface
Forces between each pair are:

• A. surface tension
• B. cohesive forces
• C. adhesive forces

Answer 1

Cohesive forces exist between identical molecules. They resist the movements of molecules.

Adhesive forces occur between different molecules. They are forces of attraction between molecules.

Surface tension is exerted on molecules that are present on surfaces of liquids. It is experienced by surface molecules due to the lack of layer of molecules above them.

Hence following is the answer
$A_1,A_2$-cohesive forces
$B,C$-adhesive forces
$D_1,D_2$-surface tension