Arsenious sulphide sol is an example of-

Correct option is A

The correct answer is (a) Colloids.
· Arsenious sulphide sol is a type of colloidal solution in which fine particles of arsenious sulphide are dispersed in water.
· In a colloid, the particle size ranges from 1 to 1000 nanometers, making it distinct from true solutions and suspensions.
· Colloids have particles that are large enough to scatter light, causing the Tyndall effect, yet they do not settle upon standing like suspensions.
Information Booster:
· Colloids have two phases: the dispersed phase (small particles) and the dispersion medium (in this case, water).
· Examples of colloids include milk (emulsion) and fog (aerosol).
· Unlike solutions, colloids do not settle and cannot be separated easily by filtration.
· Tyndall effect is a key property of colloids, where particles scatter visible light, causing the path of light to become visible in the colloid.