MCQs on Colloidal Dispersion
MCQs on Colloidal Dispersion
- Fog is an example of which type of colloidal system?
(a) Gas in liquid
(b) Solid in gasLiquid in gas
(c) Gas in gas
(d) Liquid in gas
Answer: (b)
- 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
Answer: (d)
- 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
Answer: (c)
- This method is commonly used for destruction of colloid
(a) Addition of electrolytes
(b) Condensation
(c) Dialysis
(d) Filtration by animal membrane
Answer: (a)
- 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
Answer: (d)
- If the concentration of surfactant molecules increases above the critical micelle concentration (CMC), then they
(a) become soluble
(b) dissociate
(c) associate
(d) decompose
Answer: (c)
- 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
Answer: (c)
- 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
Answer: (a)
- Which of the following is an associated colloid?
(a) Soap
(b) Sol of gold
(c) Proteins
(d) Starch
Answer: (a)
- 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
Answer: (b)
