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Gold numbers of some colloids are : Gela...

Gold numbers of some colloids are : Gelatin : `0.005-0.01`,Gum Arabic :`0.15-0.25`, Oleate :`0.04-1.0`, Starch `:15-25`. Which among these is a better protective Colloid ?

A

Gelatin

B

Starch

C

Oleate

D

Gum arabic

Text Solution

Verified by Experts

The correct Answer is:
A
Gold number =`prop(1)/("Protective power")`
i.e., The smaller the value of gold number of lyophilic sol, the greater is the protective action. Hence, gelatin will be better protective colloid.
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DISHA PUBLICATION-SURFACE CHEMISTRY-Exercise-2 :Concept Applicator
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  2. which gas will be adsorbed on a solid to greater extent ?

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  3. Which of the following adsorption isotherms represents the adsorption...

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  4. According to the adsorption theory of catalysis, the speed of the reac...

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  5. Which of the following is true in respect of chemical adsorption?

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  6. For the graph below, select correct order of temperature?

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  7. Although, nitrogen does not adsorb on a surface at room temperature, i...

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  8. Methylene blue, from its aqueous solution is adsorbed on activated cha...

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  9. In freundlich adsorption isotherm, the value of 1/n is :

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  10. Which one of the following is not applicable to the phenomenon of adso...

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  11. Which of the following statements is incorrect regarding physisorption...

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  12. In the titration of Cl^(-)ions in solution with AgNO(3) sodium salt of...

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  13. In an experiment, 200 mL of 0.5M oxalic acid is shaken with 10 g of ac...

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  14. The oxidation of oxalic acid by acidified KMnO4 becomes fast as the re...

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  15. A chemical reaction has catalyst X. Hence X

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  16. On adding AgNO(3) solution into KI solution, a negatively charged coll...

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  17. A sol is prepared by addition of excess of AgNO(3) solution in KI solu...

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  18. The gold numbers of protective colloids A,B,C and D are 0.04, 0.004, 1...

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  19. which of the following statement is not true about the oil - in - wat...

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  20. Select incorrect statement

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  21. for the coagulation of 50 mL of ferric hydroxide sol 10 mL of 0.5 M KC...

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