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What is meant by Gold number of starch i...

What is meant by Gold number of starch is 10-15?

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Gold number 10-15 means that 10-15 mg of lyophilic colloid are sufficient to just prevent the precipitation of 10 mL of a gold sol on the addition of ten par cent of sodium chloride solution.
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ICSE-SURFACE CHEMISTRY -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (VERY SHORT ANSWER QUESTIONS)
  1. KCl is added to Fe(OH)3 sol?

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

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  3. How are gold number and protective power of colloid related?

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  4. What is demulsification ?

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  5. Give four uses of emulsions.

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

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  7. How does soap help in washing clothes?

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  8. What modification can you suggest in the Hardy-Schulze law?

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  9. Why is it essential to wash the precipitate with water before estimati...

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  10. Why lyophilic colloidal sols are more stable than lyophobic colloidal ...

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  11. How can a colloidal solution be distinguished from the true solution o...

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  12. Colloidal solution can be made in water and in air as media. What dist...

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  13. Of NH3 and N2 which gas will be adsorbed more readily on the surface o...

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  14. What is the basic difference between adsorption and absorption.

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  15. What is meant by 'shape-selective catalysis' of reactions ?

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  16. What are lyophobic colloids? Give one example for them.

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  17. How can we make dialysis fast?

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  18. What is meant by Gold number of starch is 10-15?

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  19. The size of colloidal particles ranges between

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  20. Explain why river mouths have to periodically dredged to keep it navig...

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