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What is gold number?...

What is gold number?

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    MODERN PUBLICATION|Exercise EXERCISE|185 Videos

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On addition of 1 mL solution of 10% NaCl to 10 mL gold sol in the presence of 0.0250 g of starch, the coagulation is just prevented. What is the gold number of starch?

The coagulation of 100 ml of a colloidal solution of gold is completely prevented by addition of 0.25 g of starch to it before adding 10 ml of 10% NaCl solution. Calculate the gold number of starch.

Gold number gives

What does the reciprocal of gold number represent ?

50 ml of standard gold sol needs 0.05 mg of gelatine for its protection from coagulation - Calculate gold number of gelatine.

Define gold number.

MODERN PUBLICATION-SURFACE CHEMISTRY-EXERCISE
  1. What is the size of the insoluble particles present in suspension ?

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  2. How can acetone be prepared from- acetyl chloride

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  3. What is gold number?

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  4. What does the reciprocal of gold number represent ?

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  5. Does the adsorption of a gas on the surface of a solid increase or dec...

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  6. What is an adsorption isotherm? Describe Freundlich adsorption isother...

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  7. What is the role of desorption in the process of catalysis?

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  8. Why does physisorption decrease with increase of temperature ?

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  9. Why are substances like platinum and palladium often used for carrying...

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  10. What are lyophilic and lyophobic colloids ? Give one example of each.

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  11. define shape selective catalysis with one example.

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  12. How does chemical adsorption of a gas on a solid vary with temperature...

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  13. What happens when gum arabic is mixed with gold sol?

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  14. Why is chemisorption referred to as activated adsorption?

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  15. Why are some medicines more effective in the colloidal form?

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

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  17. On passing H(2)S through an aqueous solution of SO(2) a yellow turbidi...

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  18. Why activated charcoal is a better absorbent than ordinary charcoal ?

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  19. When rivers meet the ocean, they generally form delta, give resasons.

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  20. Why coloid cannot be filtered by ordinary filter paper ?

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