Surprise Quiz - Surface Chemistry

24 Questions | Total Attempts: 37

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Surprise Quiz - Surface Chemistry


Questions and Answers
  • 1. 
    Which of the following process does not occur at the interface of phases?
    • A. 

      Crystallization

    • B. 

      Heterogenous catalysis 

    • C. 

      Homogeneous catalysis

    • D. 

      Corrosion

  • 2. 
    At the equilibrium position in the process of adsorption ___________.
    • A. 

      ∆H > 0

    • B. 

      ∆H = T∆S

    • C. 

      ∆H > T∆S

    • D. 

      ∆H < T∆S

  • 3. 
    Which of the following curves is in accordance with Freundlich adsorption isotherm?
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 4. 
    Extent of physisorption of a gas increases with ___________.
    • A. 

      Increase in temperature

    • B. 

      Decrease in temperature.

    • C. 

      Decrease in surface area of adsorbent.

    • D. 

      Decrease in strength of van der Waals forces.

  • 5. 
    Which one of the following is not applicable to the phenomenon of adsorption?
    • A. 

      ∆H > 0

    • B. 

      ∆G < 0

    • C. 

      ∆S < 0

    • D. 

      ∆H < 0

  • 6. 
    In physisorption adsorbent does not show specificity for any particular gas because ______________.
    • A. 

      Involved van der Waals forces are universal.

    • B. 

      Gases involved behave like ideal gases.

    • C. 

      Enthalpy of adsorption is low.

    • D. 

      It is a reversible process

  • 7. 
    Which of the following interface cannot be obtained?
    • A. 

      Liquid-liquid

    • B. 

      Solid-liquid

    • C. 

      Liquid-gas

    • D. 

      Gas-gas

  • 8. 
    The term ‘sorption’ stands for ____________.
    • A. 

      Absorption

    • B. 

      Adsorption

    • C. 

      Both absorption and adsorption

    • D. 

      Desorption

  • 9. 
    Extent of adsorption of adsorbate from solution phase increases with ________.
    • A. 

      Increase in amount of adsorbate in solution.

    • B. 

      Decrease in surface area of adsorbent.

    • C. 

      Increase in temperature of solution

    • D. 

      Decrease in amount of adsorbate in solution.

  • 10. 
    Which of the following is not a favourable condition for physical adsorption?
    • A. 

      High pressure

    • B. 

      Negative ∆H

    • C. 

      Higher critical temperature of adsorbate

    • D. 

      High temperature

  • 11. 
    Physical adsorption of a gaseous species may change to chemical adsorption with ______________.
    • A. 

      Decrease in temperature

    • B. 

      Increase in temperature

    • C. 

      Increase in surface area of adsorbent

    • D. 

      Decrease in surface area of adsorbent

  • 12. 
    Which of the following is an example of absorption?
    • A. 

      Water on silica gel

    • B. 

      Water on calcium chloride

    • C. 

      Hydrogen on finely divided nickel

    • D. 

      Oxygen on metal surface

  • 13. 
    Which one do you like?
    • A. 

      (b), (c)

    • B. 

      (b), (c), (d)

    • C. 

      (a), (b), (c)

    • D. 

      (d)

  • 14. 
    At high concentration of soap in water, soap behaves as ____________.
    • A. 

      Molecular colloid

    • B. 

      Associated colloid

    • C. 

      Macromolecular colloid

    • D. 

      Lyophilic colloid

  • 15. 
    Which of the following will show Tyndall effect?
    • A. 

      Aqueous solution of soap below critical micelle concentration.

    • B. 

      Aqueous solution of soap above critical micelle concentration.

    • C. 

      Aqueous solution of sodium chloride.

    • D. 

      Aqueous solution of sugar.

  • 16. 
    Method by which lyophobic sol can be protected.
    • A. 

      By addition of oppositely charged sol.

    • B. 

      By addition of an electrolyte.

    • C. 

      By addition of lyophilic sol.

    • D. 

      By boiling.

  • 17. 
    Freshly prepared precipitate sometimes gets converted to colloidal solution by ___________.
    • A. 

      Coagulation

    • B. 

      Electrolysis

    • C. 

      Diffusion

    • D. 

      Peptisation

  • 18. 
    Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ sol?
    • A. 

      Na2S

    • B. 

      Na3 PO4

    • C. 

      Na2 SO4

    • D. 

      NaCl

  • 19. 
    A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as ____________.
    • A. 

      Solid sol

    • B. 

      Gel

    • C. 

      Emulsion

    • D. 

      Sol

  • 20. 
    Which one do you like?
    • A. 

      A → b → c → d → e

    • B. 

      A → c → b → d → e

    • C. 

      A → c → b → e → d

    • D. 

      A → b → c → e → d

  • 21. 
    Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?
    • A. 

      Emulsification

    • B. 

      Colloid formation

    • C. 

      Coagulation

    • D. 

      Peptisation

  • 22. 
    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 __________________.
    • A. 

      Exhibit enormous surface area.

    • B. 

      Remain suspended in the dispersion medium.

    • C. 

      Form lyophilic colloids.

    • D. 

      Are comparatively less in number

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