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- Multiple ChoicePlease save your changes before editing any questions.
Which of the following process does not occur at the interface of phases?
crystallisation
heterogenous catalysis
homogeneous catalysis
corrosion
- Multiple ChoicePlease save your changes before editing any questions.
At the equilibrium position in the process of adsorption ___________.
ΔH > 0
ΔH = TΔS
ΔH > TΔS
ΔH < TΔS
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following interface cannot be obtained?
liquid-liquid
solid-liquid
liquid-gas
gas-gas
- Multiple ChoicePlease save your changes before editing any questions.
The term ‘sorption’ stands for ____________.
absorption
adsorption
both absorption and adsorption
desorption
- Multiple ChoicePlease save your changes before editing any questions.
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.
- Multiple ChoicePlease save your changes before editing any questions.
Extent of adsorption of adsorbate from solution phase increases with ________.
increase in amount of adsorbate in solution.
decrease in surface area of adsorbent.
increase in temperature of solution.
decrease in amount of adsorbate in solution.
- Multiple ChoicePlease save your changes before editing any questions.
Which one of the following is not applicable to the phenomenon of adsorption?
ΔH > 0
ΔG < 0
ΔS < 0
ΔH < 0
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following is not a favourable condition for physical adsorption?
high pressure
negative ΔH
higher critical temperature of adsorbate
high temperature
- Multiple ChoicePlease save your changes before editing any questions.
Physical adsorption of a gaseous species may change to chemical adsorption with ______________.
decrease in temperature
increase in temperature
increase in surface area of adsorbent
decrease in surface area of adsorbent
- Multiple ChoicePlease save your changes before editing any questions.
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.
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following is an example of absorption?
Water on silica gel
Water on calcium chloride
Hydrogen on finely divided nickel
Oxygen on metal surface
- Multiple ChoicePlease save your changes before editing any questions.
At high concentration of soap in water, soap behaves as ____________.
molecular colloid
associated colloid
macromolecular colloid
lyophilic colloid
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following will show Tyndall effect?
Aqueous solution of soap below critical micelle concentration.
Aqueous solution of soap above critical micelle concentration.
Aqueous solution of sodium chloride.
Aqueous solution of sugar.
- Multiple ChoicePlease save your changes before editing any questions.
Method by which lyophobic sol can be protected.
By addition of oppositely charged sol.
By addition of an electrolyte.
By addition of lyophilic sol.
By boiling.
- Multiple ChoicePlease save your changes before editing any questions.
Freshly prepared precipitate sometimes gets converted to colloidal solution by ___________.
coagulation
electrolysis
diffusion
peptisation
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ sol?
Na2S
Na3PO4
Na2SO4
NaCl
- Multiple ChoicePlease save your changes before editing any questions.
A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as ____________.
solid solution
gel
emulsion
solution
- Multiple ChoicePlease save your changes before editing any questions.
The values of colligative properties of colloidal solution are of small order in comparison to those shown by true solutions of same concentration because of colloidal particles __________________.
exhibit enormous surface area.
remain suspended in the dispersion medium.
form lyophilic colloids.
are comparatively less in number.
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following process is not responsible for the presence of electric charge on the sol particles?
Electron capture by sol particles.
Adsorption of ionic species from solution.
Formation of Helmholtz electrical double layer.
Absorption of ionic species from solution