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WorksheetsSURFACE CHEMISTRY
Total questions: 20
Worksheet time: 13mins
At the equilibrium position in the process of adsorption ___________.
ΔH > 0
ΔH = TΔS
ΔH > TΔS
ΔH < TΔS
The term ‘sorption’ stands for ____________.
absorption
adsorption
both absorption and adsorption
desorption
Extent of physisorption of a gas increases with ___________.
increase in temperature.
decrease in temperature.
decrease in surface area of adsorbent.
decrease in strength of van der Waals forces.
Which one of the following is not applicable to the phenomenon of adsorption?
ΔH > 0
ΔG < 0
ΔS < 0
ΔH < 0
Which of the following is not a favourable condition for physical adsorption?
high pressure
negative ΔH
higher critical temperature of adsorbate
high temperature
In physisorption adsorbent does not show specificity for any particular gas because ______________.
involved van der Waals forces are universal.
gases involved behave like ideal gases.
enthalpy of adsorption is low.
it is a reversible process.
At high concentration of soap in water, soap behaves as ____________.
molecular colloid
associated colloid
macromolecular colloid
lyophilic colloid
Freshly prepared precipitate sometimes gets converted to colloidal solution by ___________.
coagulation
electrolysis
diffusion
peptisation
Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ sol?
Na2S
Na3PO4
Na2SO4
NaCl
Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?
Emulsification
Colloid formation
Coagulation
Peptisation
When dispersed phase is liquid and dispersion medium is gas, the colloidal system is called:
Aerosol
Emulsion
Smoke
Gel
Peptization denotes:
Digestion of food
Hydrolysis of protein
Breaking and dispersion into colloidal state
Precipitation of solid from colloidal dimension
Bredig's arc method is used for the preparation of colloidal soln of:
Metal like silver, gold, etc
Organic compounds
Two liquids
Inorganic compounds
'Greater the valency, the higher is the ciagulating power of ion'. This rule was introduced by
Hardy Schulz
Maxwell
Kisses lewis
Faraday
(a) is the device used for the treatment of smoke coming out of chimneys
Temperature above which micelles formation takes place is called as
Critical temperature
Kraft temperature
Freezing point
None of these
What is an emulsion?
Solid in liquid colloidal sol.
Solid in gas colloidal sol.
Liquid in liquid colloidal sol.
All of the above
(a) force is responsible for physisorption
Adsorption is a................process
Exothermic process
Endothermic process
Both
None
In....................catalysis state of reactants and catalyst is different
Homogeneous
Heterogeneous
Both
None
