Quiz  /  Surface Chemistry Gate & PSU MCQ Questions With Answers

  • 1. 
    In gas masks, activated charcoal is used to ---------- the toxic gases andvapours.

  • adsorb
  • absorb
  • desorb
  • sorb

  • 2. 
    The amount of heat evolved when one mole of a gas is adsorbed on a solid surface is called as

  • Molar enthalpy of absorption
  • Molar enthalpy of desorption
  • Molar enthalpy of adsorption
  • entropy of adsorption

  • 3. 
    Softening of ---------------- by the ion exchange principle isbased on the adsorption of cations.

  • ground water
  • drinking water
  • hard water
  • sea water

  • 4. 
    Rough surface of an adsorbent has

  • More porus
  • Non porus
  • More active centres
  • Less active centres

  • 5. 
    Silica and alumina are used as adsorbents for removing-------------- and controlling humidity in a room

  • moisture
  • cooling
  • hot
  • temperature

  • 6. 
    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

  • 7. 
    Absorption is a

  • Bulk phenomena
  • Surface phenomena
  • Both
  • None of these

  • 8. 
    At high concentration of soap in water, soap behaves as ____________.

  • molecular colloid
  • associated colloid
  • macromolecular colloid
  • lyophilic colloid

  • 9. 
    Chromatography is used to separate different constituents present in a ------------

  • solid
  • liquid
  • gas
  • mixture

  • 10. 
    Surface compound formation takes place in

  • Physical adsorption
  • Desorption
  • Chemical adsorption
  • Sorption

  • 11. 
    Chemisorption is held by

  • Covalent bond
  • Chemical forces
  • Van der Waal forces
  • Centrifugal

  • 12. 
    Adsorption is a

  • Bulk phenomena
  • Surface phenomena
  • Both
  • None of these

  • 13. 
    Which of the following is not a favourable condition for physical adsorption?

  • high pressure
  • negative ΔH
  • higher critical temperature of adsorbate
  • high temperature

  • 14. 
    In gas masks which substance is used to absorb toxic gases and vapours?

  • Coal powder
  • Animal charcoal
  • Wood charcoal
  • Activated charcoal

  • 15. 
    When the concentration of adsorbate is more on the surface than the bulk of the adsorbent it is called as

  • Positive adsorption
  • Negative adsorption
  • Positive absorption
  • Negative absorption

  • 16. 
    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.

  • 17. 
    Physisorption is held by

  • Covalent forces
  • Chemical forces
  • Vander Waal forces
  • Centrifugal forces
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