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Process by which a stable colloidal solu...

Process by which a stable colloidal solution can be produced from substance originally present in massive form when the colloidal particles pre-exist in substance to be dispersed is known as

A

coagulation

B

dispersion

C

peptization

D

Precipitation

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The correct Answer is:
B
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In a colloidal state, the particle size of he dispersed phase ranges between 10^(3) to 10^(6) pm and the colloidal sol is of heterogeneous nature. Depending upon the ease with which these sols are formed, the colloidal sols are cassified as lyophilic and lyophobic. THe stability of a colloidal sol is due to the presence of charge on the sol particles and the neutralisation of the same is known as coagulation or precipitation. The coagulationg power of the active ions of he electrolytes can be compared with the help of Hardy-Schulze Law. The protecting power of the lyophilic sols can be compared with the help of gold number. Lesser the value of gold number, more will be the protecting power of the lyophilic sol. Lyophilic sols are more stable than lyophobic sols because

MARVEL PUBLICATION-SURFACE CHEMISTRY-MULTIPLE CHOICE QUESTIONS - HIGHER LEVEL
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  2. which of the following is used to adsorb water ?

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  9. The equilibrium attained in case of physical adsorption is

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  10. Increase in concentration of adsorbate at the surface of a substance a...

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  11. The impurities present in rain water possess ……..charge.

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  12. Latex is a colloidal solution of rubber particles which are

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  14. Milk can be preserved by adding a few drops of

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  15. The example of heteropolar sol. is

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  16. Tails of comets are visible due to

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  17. Charcoal adsorbs not only gases but also acts as

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  18. Which of the following is not correct?

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  19. A colloidal solution is affected greatly by all of the following excep...

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  20. Blood contains .

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