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Describe Bredig's arc method of preparat...

Describe Bredig's arc method of preparation of colloids with a neat diagram.

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Electrical disintegration or Bredig's Arc method : This process involves dispersion as well as condensation. Colloidal sols of metals such as gold, silver, platinum, etc., are prepared by this method. In this method, electric arc is struck between electrodes of the metal immersed in the dispersion medium. The intense heat produced vapourises the metal, which then condenses to form particles of colloidal size.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-SURFACE CHEMISTRY-SHORT ANSWER QUESTIONS
  1. What are lyophilic and lyophobic sols ? Give one example for each type...

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  2. Name a substance whose molecules consist of lyophilic as well as lyoph...

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  3. Describe Bredig's arc method of preparation of colloids with a neat di...

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  4. Name any four examples of preparation of colloids by chemical methods ...

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  5. Describe the purification of colloidal solution by the phenomenon of d...

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  6. Explain the formation of micelles with a neat sketch.

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  7. Action of soap is due to emulsification and micelle formation. Comment...

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  8. Explain the phenomenon of Brownian movement giving reasons for the occ...

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  9. Name the four positively charged sols.

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  10. Name the four negatively charged sols.

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  11. Explain the terms helmholtz electrical double layer and zeta potential...

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  12. Explain with a neat sketch the phenomenon of electrophoresis.

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  13. What is electrophoresis ?

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  14. Explain the Coagulation.

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  15. What is dall effect ?

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  16. Explain the phenomenon observed When a beam of light is passed thro...

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  17. Explain the phenomenon observed An electrolyte, NaCI is added to hyd...

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  18. Explain the phenomenon observed An eleetrlc current is passed thro...

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  19. Describe cottrell smoke precipitator with a neat diagram.

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  20. Amoung NaCl, Na(2)SO(4) , Na(3)PO(4) electrolytes , Na(3)PO(4) which i...

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