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Define Gold number....

Define Gold number.

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ICSE-SURFACE CHEMISTRY -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) ( LONG ANSWER QUESTIONS)
  1. How does electrophoresis provide information about the sign of charge ...

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

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

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  4. Describe briefly how gold sols can be prepared ?

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  5. Define Gold number.

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  6. Name any two protective colloids.

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

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  8. In what respect electrophoresis differ from electrolysis ?

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  9. What are enzymes inhibitors ?

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

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

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

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

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

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

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  16. What is demulsification ?

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  17. Give four uses of emulsions.

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  18. What do you mean by STDs?

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  19. Describe some features of catalysis by zeolites. (i) Medicines are ...

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  20. Explain either Brownian movement or Tyndall effect.

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