Which of the following is the homogeneous solution of resins in the alcohol?

Solution vs. Suspension in Coatings

This question hinges on the difference between a solution and a suspension. A homogeneous solution is a mixture where the components are uniformly mixed and cannot be visually distinguished (e.g., salt dissolved in water). A suspension is a mixture where solid particles are dispersed, but not dissolved, in a liquid (e.g., sand in water). Paints are suspensions, while varnishes are true solutions.

Detailed Analysis of the Options

(a) Distemper

Composition: Distemper is a water-based paint. It is a suspension of solid particles like chalk and pigments in water, with glue as a binder.
Analysis: It is not a solution, it is not made with resin, and its solvent is water, not alcohol. Therefore, it is incorrect.

(b) Enamel paint

Composition: Enamel paint is a suspension of solid pigments in a varnish vehicle.
Analysis: Although its liquid vehicle (varnish) is a solution, the final paint product is an opaque suspension because of the added pigments. It does not fit the description of a homogeneous solution.

(c) Plastic paint

Composition: Plastic paint (emulsion) is a water-based suspension (or more accurately, an emulsion) of plastic polymer particles and pigments.
Analysis: Like distemper, it is a suspension, and its liquid base is water, not alcohol. Therefore, it is incorrect.

Comparison of Coatings