At the critical micelle concentration (CMC) the surfactant molecules
Decompose
Dissociate
Associate
Become completely soluble
Which one of the following forms micelles in aqueous solution above certain concentration?
Urea
Dodecyl trimethyl ammonium chloride
Pyridium chloride
Glucose
Which of the following forms cationic micelles above certain concentration?
Sodium ethyl suhphate
Sodium acetate
Cetyl trimethyl ammonium bromide
_____________arises due to the fact that the surface particles of the adsorbent are not in the same environment as the particles inside the bulk.
Absorption
Adsorption
desorption
Sorption
The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed as ___________
absorption
adsorption
adhesion
According to the adsorption theory of catalysis, the speed of the reaction increases because
Absorption produces heat which increases the speed of the reaction
Adsorption lowers the activation energy of the reaction
The concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption.
In the process of adsorption, the activation energy of the molecules becomes large
The extent of adsorption increases with the increase of __________of the adsorbent.
Pressure
temperature
surface area
quantity
The method usually employed for the precipitation of a colloidal solution is
Dialysis
Addition of electrolytes
Diffusion through animal membrane
Condensation
The ability of anion to bring about coagulation of a given colloid depends upon
Its charge
Th sign of the charge alone
The magnitude of its of its charge
Both magnitude and sign of its charge
During dialysis
Only solvent molecules can diffuse
Solvent molecules, ions and colloidal particles can diffuse
All kinds of particles can diffuse through the semipermeable membrane