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
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
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
Which of the following is an associated colloid?
(a) Soap
(b) Sol of gold
(c) Proteins
(d) Starch
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
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
If the concentration of surfactant molecules increases above the critical micelle concentration (CMC), then they
(a) Become soluble
(b) Dissociate
(c) Associate
(d) Decompose
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
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
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
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