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Briefly describe the Bredig's arc method...

Briefly describe the Bredig's arc method for the preparation of lyophobic colloids.

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ICSE-SURFACE CHEMISTRY -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) ( SHORT ANSWER QUESTIONS)
  1. Define coagulation.

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  2. Bleeding from a fresh cut can be stopped by applying alum. Give reason...

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  3. Briefly describe the Bredig's arc method for the preparation of lyopho...

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  4. What is Tyndall effect ? Mention one of its applications.

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  5. Explain what is meant by Tyndall effect ?

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  6. What happens when freshly precipitated Fe(OH)3 is shaken with small am...

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  7. Describe briefly the purification of a colloid by dialysis.

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  8. Explain the following terms: Tyndall effect

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  9. Explain the following terms: Dialysis

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  10. What is meant by an emulsion and emulsifying agents?

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  11. Give four uses of emulsions.

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  12. What is demulsification ?

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  13. What is the main cause of charge on a colloidal solution?

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  14. Differentiate between: Dialysis and ultrafiltration

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  15. Differentiate between: Electrophoresis and electro-osmosis.

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  16. What are micelles ? Give an example of a micellers system.

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  17. What is meant by critical micelle concentration and Kraft temperature ...

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  18. Differentiate between lyophilic and lyophobic colloids.

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  19. Differentiate between sol and emulsion.

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  20. Milk is an emulsion. Identify the dispersed phase and emulsifier in mi...

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