Quiz  /  Surface Chemistry Class 12 MCQ Questions With Answers

  • 1. 
    At the equilibrium position in the process of adsorption ___________.

  • ΔH > 0
  • ΔH = TΔS
  • ΔH > TΔS
  • ΔH < TΔS

  • 2. 
    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.

  • 3. 
    Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ sol? (AgI/Ag+ implies positive sol)

  • Na2SNa_2SNa2​S
  • NaCl
  • Na3PO4Na_3PO_4Na3​PO4​
  • Na2SO4Na_2SO_4Na2​SO4​

  • 4. 
    Roushon loves

  • tory
  • Victoria
  • plum
  • all are correct

  • 5. 
    'Greater the valency, the higher is the ciagulating power of ion'. This rule was introduced by

  • Hardy Schulz
  • Maxwell
  • Kisses lewis
  • Faraday

  • 6. 
    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

  • 7. 
    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

  • 8. 
    The difference in potential of fixed and mobile layer is called ..........

  • Zeta Potential
  • Colloidal potential
  • Electrostatic potential
  • All of above

  • 9. 
    Which one of the following is not applicable to the phenomenon of adsorption?

  • ΔH > 0
  • ΔG < 0
  • ΔS < 0
  • ΔH < 0

  • 10. 
    Adsorption is a................process

  • Exothermic process
  • Endothermic process
  • Both
  • None

  • 11. 
    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

  • 12. 
    If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as

  • Emulsion
  • Solid Sol
  • Gel
  • Sol

  • 13. 
    Lyophobic colloids are

  • irreversible
  • water loving
  • solvent loving
  • reversible

  • 14. 
    Which of the following process does not occur at the interface of phases?

  • crystallisation
  • heterogenous catalysis
  • homogeneous catalysis
  • corrosion

  • 15. 
    Freshly prepared precipitate sometimes gets converted to colloidal solution by ___________.

  • coagulation
  • electrolysis
  • diffusion
  • peptisation

  • 16. 
    During adsorption, entropy

  • increases
  • decreases
  • remains same
  • none of the above

  • 17. 
    Extent of physisorption increases with

  • decrease in surface area
  • increase in temperature
  • decrease in temperature
  • decrease in strength of van der waal forces

  • 18. 
    Area of interface separating two phases depends on

  • shape of the particles
  • size of the particles
  • temperature of the particles
  • independent

  • 19. 
    Adsorption is invariably an

  • endothermic process
  • exothermic process
  • can't be distinguished
  • both endothermic & exothermic

  • 20. 
    Peptisation is a process of

  • Precipitation of colloid
  • Dispersion of precipitate
  • purification of colloids
  • Movement of colloid under electric potential

  • 21. 
    Which forms multi molecular layers during adsorption

  • vander waal's adsorption
  • physical adsorption
  • Freundlich adsorption
  • All are correct

  • 22. 
    Temperature above which micelles formation takes place is called as

  • Critical temperature
  • Kraft temperature
  • Freezing point
  • None of these

  • 23. 
    When a small amount of FeCl3 is added to a freshly precipitated Fe(OH)3, b reddish brown colloidal solution is obtained. This phenomenon is known as

  • dialysis
  • peptization
  • protection
  • dissolution

  • 24. 
    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.

  • 25. 
    According to adsorption theory of catalysis, the speed of the reaction increases because

  • The concentration of the 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.
  • adsorption produces heat which increases the speed of the reaction
  • adsorption lowers the activation energy of the reaction.

  • 26. 
    In....................catalysis state of reactants and catalyst is different

  • Homogeneous
  • Heterogeneous
  • Both
  • None
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