SURFACE CHEMISTRY (Intermediate)

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Across
  1. 1. Colligative properties of colloidal solutions have _______magnitude than true solutions. (5)
  2. 6. Physisorption of a gaseous species may change to Chemisorption with ________ in temperature. (8)
  3. 8. Minimum temperature above which micellisation takes place. (5)
  4. 9. _______ has multimolecular layers of adsorption. (13)
  5. 10. In Contact process, the oxidation of SO2(g) in the presence of V2O5(s) as a catalyst is an example of ________ catalysis. (hint: phase of the substances involved) (13)
  6. 12. A non-catalyst substance that increases the efficiency of the catalyst. (8)
  7. 13. Conversion of a freshly formed precipitate into a sol by adding a small amount of an electrolyte with a preferential common ion. (11)
  8. 16. Phenomenon of uniform distribution of a substance throughout the bulk of another substance. (10)
  9. 17. Gold/silver sols are commonly prepared by this method. ________'s arc method. (6)
  10. 19. Enzymes are commonly termed as ________. (11)
  11. 20. Adsorption occurs due to the tendency of a substance to ______ its surface energy. (8)
  12. 21. A catalyst lowers the _______ energy barrier of a reaction. (10)
  13. 22. Freundlich Adsorption Isotherm shows that under low pressure range, the extent of adsorption vs pressure graph is ________. (6)
Down
  1. 2. A colloid where both dispersed phase and dispersion medium are liquids. (8)
  2. 3. Colloidal particles usually have size ranging from 1-_____ nanometre. (hint: in words) (7)
  3. 4. The movement of colloidal particles to a certain electrode under the influence of an electric field. (15)
  4. 5. Haber's Process uses finely divided iron as catalyst and _______ as a promoter. (10)
  5. 7. Adsorption has a ________ change in enthalpy value. (8)
  6. 11. Tyndall effect is negligible for __________ sols. (9) (hint: pertaining to affinity or repulsion for water)
  7. 14. Compounds containing both hydrophilic and hydrophobic parts in their molecule. (10)
  8. 15. The protective power of a colloid is expressed by the ______ number. (4)
  9. 18. The Hardy-Schulz rule gives information about the _______ power of an ion in a colloidal solution.