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The charge on the colloidal particle is ...

The charge on the colloidal particle is due to preferential adsorption of inos.

A

presence of electrolyte.

B

very small size of particles.

C

adsorption of ions from the solution,

D

none of these.

Text Solution

Verified by Experts

The correct Answer is:
C
Linseed oil, lanolin and glycogen attract water hence contain a hydrophilic structure, but rubber does not attract water and thus does not contain a hydrophobic structure.
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Read the passage given below and answer the following questions: Some colloids are stable by their nature, i.e., gels, alloys, and solid foams. Gelatin and jellies are two common examples of a gel. The solid and liquid phases in a gel are interdispersed with both phases being continuous. In most systems, the major factor influencing the stability is the charge on the colloidal particles. If a particular ion is preferentially adsorbed on the surface of the particles, the particles in suspension will repel each other, thereby preventing the formation of aggregates that are larger than colloidal dimensions. The ion can be either positive or negative depending on the particular colloidal system, i.e., air bubbles accumulate negative ions, sulphur particles have a net negative charge in a sulphur sol, and the particles in a metal hydroxide sol are positively charged. Accumulation of charge on a surface is not an unusual phenomenon-dust is attracted to furniture surfaces by electrostatic forces. When salts are added to lyophobic colloidal systems the colloidal particles begin to form larger aggregates and a sediment forms as they settle. This phenomenon is called flocculation, and the suspension can be referred to as flocculated, or colloidally unstable. If the salt is removed, the suspension can usually be restored to its original state, this process is called deflocculation or peptization. The original and restored colloidal systems are called deflocculated, peptized, or stable sols. Why does a small amount of salt have such a dramatic effect on the stability of a lyophobic colloidal system? The answer lies in an understanding of the attractive and repulsive forces that exist between colloidal particles. Van der Waals forces are responsible for the attractions, while the repulsive forces are due to the surface charge on the particles. In a stable colloid, the repulsive forces are of greater magnitude than the attractive forces. The magnitude of the electrical repulsion is diminished by addition of ionized salt, which allows the dispersed particles to aggregate and flocculate. River deltas provide an example of this behaviour. A delta is formed at the mouth of a river because the colloidal clay particles are flocculated when the freshwater mixes with the salt water of the ocean (source: Sarquis, J. (1980). Colloidal systems. Journal of Chemical Education, 57(8), 602. doi:10.1021/ed057p602 ) When Van der Waals forces are greater than forces due to the surface charge on the particles,

DISHA PUBLICATION-SURFACE CHEMISTRY-Exercise-2 :Concept Applicator
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  3. The oxidation of oxalic acid by acidified KMnO4 becomes fast as the re...

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  4. A chemical reaction has catalyst X. Hence X

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

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

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

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

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  9. Select incorrect statement

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

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  11. If the dispersed phase is a liquid and the dispersion medium is a soli...

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  12. Coagulation value of the electrolytes AlCl(3) and NaCl for As(2)S(3) s...

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  13. The density of gold is 19 g //cm^(2).Find the volume of 95 g of gold.

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  14. The charge on the colloidal particle is due to preferential adsorption...

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  15. which of the following does not contain a hydrophobic structures.

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  16. A thixotropic gel is characterised by

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  17. which property of colloidal solution is independent of charge on the c...

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  18. Which one of the following characteristics is associated with adsorpti...

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  19. Fog is a colloidal solution of

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  20. Which one of the following statements is not correct?

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