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The efficiency of a protective colloid i...

The efficiency of a protective colloid is described in terms of

A

gold number

B

flocculation number

C

valency of counter ion

D

Tyndall effect.

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The protective power of colloids is measured in the unit ................. .

the protective power of the lyophilic colloids es expressed in terms of gold number, a term introduced by Zsigmondy. Gold number is the number of mili - gram of the protective colloid which prevent the coagulation of 10 mL of red gold sol , when 1 mL of a 10 per cent solution of sodium chloride is added to it . thus smaller the gold number of lyophillic colloid, the greater is the protective power. gold number given an indication of : protective nature of colloids, purity of gold in suspension, the charge on a colloidal solution of gold, gram of gold per litre of solution.

MODERN PUBLICATION-SURFACE CHEMISTRY-EXERCISE
  1. Express 8 in roman numerals.

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  2. Explain the following- Uses of brass alloy.

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  3. The efficiency of a protective colloid is described in terms of

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  4. The dispersion medium in aerosol is

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  5. The function of enzymes in the living system is to

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  6. The ultrafiltration Process of purification of colloidal solutions is ...

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  7. In physical adsorption the forces associated are

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  8. Milk is a colloidal solution of ................ in ............ .

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  9. Colloids can be purified by peptization. (True/False)

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  10. The protective power of colloids is measured in the unit ................

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  11. The curve showing the variation of adsorption with pressure at constan...

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  12. Differentiate between absorption and adsorption.

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  13. What do you understand by true solution, colloidal solution and suspen...

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  14. Comment on the statement that “colloid is not a substance but a state ...

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  15. An atom of element E contains 3 protons, 3 electrons and 4 neutrons : ...

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  16. How are colloids classified on the basis of : interaction between disp...

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  17. How will you prepare a collidal solution of gold?

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  18. Explain electrophoresis. How is it helpful in causing coagulation of c...

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  19. Write two differences between sols and emulsions.

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  20. Explain the following- Uses of bronze alloy.

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