CBSE  /  Class 12  /  Chemistry  /  Surface Chemistry

  • 1. 
    Which of the following can adsorb larger volume of hydrogen gas?

  • Finely divided platinum
  • Colloidal solution of palladium
  • Small pieces of palladium
  • A single metal surface of platinum

  • 2. 
    Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask?

  • H
  • O
  • N
  • SO

  • 3. 
    Which kind of catalysis can be explained on the basis of adsorption theory ?

  • Homogeneous catalysis
  • Heterogeneous catalysis
  • Negative catalysis
  • Auto catalysis

  • 4. 
    A colloidal system is which liquid is dispersed phase and solid is dispersion medium is classified as

  • gel
  • sol
  • emulsion
  • aerosol

  • 5. 
    Which of the following will not form a colloidal system?

  • Solid-gas
  • Liquid-gas
  • Gas-gas
  • Gas-liquid

  • 6. 
    Fog in an example of colloidal system of

  • liquid in gas
  • gas in liquid
  • solid in gas
  • gas in solid

  • 7. 
    Substances which behave as normal electrolytes solution at low concentration and exhibit colloids properties at higher concentration are called

  • lyophilic colloids
  • lyophobic colloids
  • macromolecular colloids
  • associated colloids

  • 8. 
    Which of the following acts as the best coagulating agent for ferric hydroxide sol?

  • Potassium ferrocyanide
  • Potassium chloride
  • Potassium oxalate
  • Aluminium chloride

  • 9. 
    The formation of micelles takes place only above

  • critical temperature
  • Kraft temperature
  • inversion temperature
  • absolute temperature

  • 10. 
    At CMC (critical micelle concentration) the surface molecules

  • dissociate
  • associate
  • become bigger in size due to adsorption
  • become smaller in size due to decomposition
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