Multiple Choice QuestionsAdsorption is multilayer in the case of
physical adsorption
chemisorption
Both (a) and (b)
None of the above
Which of the following is not a method of preparation of colloidal solution?
Electrical dispersion
Peptization
Coagulation
Mechanical dispersion
Consider the following statements. The role of catalyst is to
(1) reduce the activation energy
(2) increase the activation energy
(3) increase the rate of attainment of equilibrium
(4) decrease the rate of attainment of equilibrium
Which ofthe statements given above are correct?
(2) and (4)
(1) and (4)
(1) and (3)
(2) and (3)
Finely divided powder of charcoal adsorbs the substance X to a large extent. This is because
the surface area of charcoal is increased
charcoal powder can be spread over X homogeneously
X can be spread over charcoal homogeneously
charcoal is highly reactive
Which one of the following has minimum gold number?
Starch
Sodium oleate
Gelatin
Gum arabic
C.
Gelatin
Gold number is defined as the minimum amount of lyophilic colloid in milligrams, which prevents the flocculation (coagulation) of 10 mL gold sol (containing 0.5 to 0.06 g of gold per litre) by the addition of 1 mL of 10% NaCl solution. More is the gold number, less is the protective power of the lyophilic colloid, since it means that the amount required is more,
| Protective colloids | Gold number |
| Starch | 15 - 25 |
| Sodium oleate | 0.4 |
| Gelatin | 0.005 - 0.01 |
| Gum arabic | 0.15 |
Syneresis is a process in which
spontaneous outcome of internal liquid without disturbing gel structure takes place
sol particles absorb light
aggregation of molecules to form micelle
separation of soluble impurities from sols take place
The simplest way to check whether a system is colloidal is by
electrodialysis
finding out particle size
Tyndall effect
Brownian movement
Which statement is true?
The adsorption of H2 by platinum black is known as sorption
The adsorption of H2 by charcoal is known as occlusion
The adsorption of H2 by platinum black is known as occlusion
The absorption of H2 by charcoal is known as chemisorption.
In the case of auto catalysis
product catalysis
solvent catalysis
reactant catalysis
heat produced in the reaction catalysis
Which among the following statements is false?
The adsorption may be monolayered or multilayered
Particle size of adsorbent will not affect the amount of adsorption
Increase of pressure increases amount of adsorption
Increase of temperature may decrease the amount of adsorption
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