Colloidal Dispersion MCQs

A colloidal dispersion, or colloid, is a heterogeneous system distinct from both suspensions and solutions. It contains very fine particles, known as the dispersed phase, distributed throughout the dispersion medium. The particle size of the dispersed phase in a colloid is larger than that in a solution but smaller than in suspensions. Colloids are classified based on the type and physical state of both the particles and the dispersion medium. Examples of colloids include gels, sols, foams, emulsions, and aerosols.

This method is commonly used for destruction of colloid

(a) Addition of electrolytes
(b) Condensation
(c) Dialysis
(d) Filtration by animal membrane

(a) Addition of electrolytes

The position occupied by non-polar hydrophobic and polar hydrophilic group in a micelle is

(a) Non-polar towards the outside and polar towards inside
(b) Polar towards the outside and non-polar towards inside
(c) Both present only at the surface
(d) Both distributed throughout

(b) Polar towards the outside and non-polar towards inside

Which of the following properties of colloids does not depend on the charge on particles?

(a) Coagulation
(b) Electro-osmosis
(c) Electrophoresis
(d) Tyndall effect

(d) Tyndall effect

Which of the following is an associated colloid?

(a) Soap
(b) Sol of gold
(c) Proteins
(d) Starch

(a) Soap

Fog is an example of which type of colloidal system?

(a) Gas in liquid
(b) Solid in gas
(c) Gas in gas
(d) Liquid in gas

(b) Solid in gas

The diameter of particles in colloidal system is

(a) 10⁻⁹ m to 10⁻⁶ m
(b) 10⁻¹⁰ m to 10⁻⁴ m
(c) 10⁻¹² m to 10⁻⁹ m
(d) 10⁻⁷ m to 10⁻⁵ m

(a) 10⁻⁹ m to 10⁻⁶ m

If the concentration of surfactant molecules increases above the critical micelle concentration (CMC), then they

(a) Become soluble
(b) Dissociate
(c) Associate
(d) Decompose

(c) Associate

The term used to determine the protecting power of a lyophilic colloid is

(a) Oxidation number
(b) Coagulation value
(c) Gold number
(d) Critical micelle concentration

(c) Gold number

The ability of an ion to coagulate a given colloid is dependent on the

(a) Only charge
(b) Magnitude
(c) Both magnitude and charge
(d) Sign of the charge

(c) Both magnitude and charge

Which of the following compounds form micelles, if their concentration is increased in aqueous solution?

(a) Urea
(b) Glucose
(c) Pyridinium chloride
(d) Dodecyl trimethyl ammonium chloride

(d) Dodecyl trimethyl ammonium chloride