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SURFACE CHEMISTRY MCQs

Total Questions : 20 | Page 2 of 2 pages
Question 11. In physisorption adsorbent does not show specificity for any particular gas because ______________
  1.    involved van der Waals forces are universal
  2.    it is a reversible process
  3.    Enthalpy is low
  4.    Gases behave as ideal gases
 Discuss Question
Answer: Option A. -> involved van der Waals forces are universal
Question 12. Extent of physisorption increases with
  1.    decrease in surface area
  2.    increase in temperature
  3.    decrease in temperature
  4.    decrease in strength of van der waal forces
 Discuss Question
Answer: Option C. -> decrease in temperature
Question 13. The minimum temperature required for formation of associated colloid is called
  1.    Critical temperature
  2.    Inversion temperature
  3.    Kraft temperature
  4.    Boyle's temperature
 Discuss Question
Answer: Option C. -> Kraft temperature
Question 14. Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ sol? (AgI/Ag+ implies positive sol)
  1.    Na2SNa_2SNa2​S
  2.    NaCl
  3.    Na3PO4Na_3PO_4Na3​PO4​
  4.    Na2SO4Na_2SO_4Na2​SO4​
 Discuss Question
Answer: Option C. -> Na3PO4Na_3PO_4Na3​PO4​
Question 15. If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as
  1.    Emulsion
  2.    Solid Sol
  3.    Gel
  4.    Sol
 Discuss Question
Answer: Option C. -> Gel
Question 16. The movement of colloidal particles towards the oppositely charged electrodes on passing electric current is known as
  1.    Tyndall Effect
  2.    Brownian Motion
  3.    Electrophoresis
  4.    Coagulation
 Discuss Question
Answer: Option C. -> Electrophoresis
Question 17. Peptisation is a process of
  1.    Precipitation of colloid
  2.    Dispersion of precipitate
  3.    purification of colloids
  4.    Movement of colloid under electric potential
 Discuss Question
Answer: Option B. -> Dispersion of precipitate
Question 18. Which of the following ion will have highest coagulating power for coagulating a negatively charged sol?
  1.    NaClNaClNaCl
  2.    CaCl2CaCl_2CaCl2​
  3.    AlCl3AlCl_3AlCl3​
  4.    KClKClKCl
 Discuss Question
Answer: Option C. -> AlCl3AlCl_3AlCl3​
Question 19. 'Greater the valency, the higher is the ciagulating power of ion'
  1.    Hardy Schulz
  2.    Maxwell
  3.    Kisses lewis
  4.    Faraday
 Discuss Question
Answer: Option A. -> Hardy Schulz
Question 20. In Freundlich adsorption isotherm x/m = Kp1/n, the value of ‘n’ at low pressure is
  1.    more than one.
  2.    less than one.
  3.    equal to one.
  4.    from zero to one.
 Discuss Question
Answer: Option C. -> equal to one.

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