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What is most accepted reason for the pre...

What is most accepted reason for the presence of charge on colloids?

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The correct Answer is:
The preferential adsorption of common-ion from dispersion medium
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Read the given passage and answer the question that follow: Colloidal particles always carry an electric charge which may be either positive or negative. For example, when AgNO_3 solution is added to KI solution, a negatively charged colloidal sol is obtained. The presence of equal and similar charges on colloidal particles provide stability to the colloidal sol and if, somehow, charge is removed. coagulation of sol occurs. Lyophobic sols are readily coagulated as compared to lyophilic sols. What is the reason for the charge on sol particles ?

Read the given passage and answer the question that follow: Colloidal particles always carry an electric charge which may be either positive or negative. For example, when AgNO_3 solution is added to KI solution, a negatively charged colloidal sol is obtained. The presence of equal and similar charges on colloidal particles provide stability to the colloidal sol and if, somehow, charge is removed. coagulation of sol occurs. Lyophobic sols are readily coagulated as compared to lyophilic sols. What is the reason for the charge on sol particles ?

AAKASH INSTITUTE-SURFACE CHEMISTRY -TRY YOURSELF
  1. Why true solutions do not exhivit tyndall effect?

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  2. Write the name of four methods to coagulate lyphobic colloids

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  3. What is most accepted reason for the presence of charge on colloids?

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  4. Define coagulation value.

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  5. Why adsorption is exothermic ?

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  6. What is the effect on entropy change (Delta S) in adsorption ?

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  7. Which adsorption has low enthalpy of adsorption ?

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  8. Low temperature is favourable for which type of adsorption ?

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  9. Which type of gases are readily adsorbed by solids ?

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  10. Write any two characteristics of Chemisorption.

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  11. Why dows physisoption decrease with increase of temperature ?

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  12. What is the change in mass and composition of catalyst after the compl...

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  13. Write the name of scientist who suggested the term catalyst first?

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  14. Metals of how many groups of periodic table show macimum catalytic act...

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  15. Which catalyst is used to convert alcohol directly to petrol?

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  16. What are optimum temperature and pH for the enzymes to act best ?

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  17. Which enzyme converts milk into curd?

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  18. By which method preciptate is converted into colloids ?

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  19. Give two examples of multimolecular colloides .

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  20. On which principle oleansing action of soap is based ?

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