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Briefly describe the preparation of coll...

Briefly describe the preparation of colloidal `As_2 S_3`. How can you demonstrate the presence of colloidal particles in the solution and electric charge for the particles ?

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ICSE-SURFACE CHEMISTRY -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) ( LONG ANSWER QUESTIONS)
  1. A certain colloidal solution is not affected by the addition of small ...

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  2. In what type of sol will the surface tension and viscosity be similar ...

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  3. Briefly describe the preparation of colloidal As2 S3. How can you demo...

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  4. Sols can be hydrophilic and hydrophobic. What do these terms mean?

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  5. How does electrophoresis provide information about the sign of charge ...

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  6. Gelatin which is a peptide is added in ice-creams. What can be its ro...

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  7. Colloidal sulphur exhibits Brownian movement while a solution of sulph...

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  8. Describe briefly how gold sols can be prepared ?

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  9. Define Gold number.

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  10. Name any two protective colloids.

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  11. Why is the cotton cloth required to be treated with a mordant, before ...

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  12. In what respect electrophoresis differ from electrolysis ?

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  13. What are enzymes inhibitors ?

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  14. Explain the term heterogeneous catalysis. Give examples of heterogeneo...

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  15. What is the role of adsorption in heterogeneous catalysis?

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  16. Explain the terms: (i) Active centres (ii) inhibitors (iii) promote...

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  17. How are colloids classified on the basis of (i) physical states of ...

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  18. Give two chemical methods for the preparation of colloidal solutions.

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  19. What are emulsions ? What are their different types ? Give an example ...

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  20. What is demulsification ?

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