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प्रश्न
What are micelles? Give an example of a micellers system.
उत्तर
Micelle formation is done by substances such as soaps and detergents when dissolved in water. The molecules of such substances contain a hydrophobic and a hydrophilic part. When present in water, these substances arrange themselves in spherical structures in such a manner that their hydrophobic parts are present towards the centre, while the hydrophilic parts are pointing towards the outside (as shown in the given figure). This is known as micelle formation.
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संबंधित प्रश्न
What is the difference between multimolecular and macromolecular colloids? Give one example of each. How are associated colloids different from these two types of colloids?
What type of colloid is formed when a gas is dispersed in a liquid? Give an example
Write an important characteristic of lyophilic sols.
At high concentration of soap in water, soap behaves as ______.
Which of the following options are correct?
(i) Micelle formation by soap in aqueous solution is possible at all temperatures.
(ii) Micelle formation by soap in aqueous solution occurs above a particular concentration.
(iii) On dilution of soap solution micelles may revert to individual ions.
(iv) Soap solution behaves as a normal strong electrolyte at all concentrations.
Method of formation of solution is given in Column I. Match it with the type of solution given in Column II.
| Column I | Column II |
| (i) Sulphur vapours passed through cold water | (a) Normal electrolyte solution |
| (ii) Soap mixed with water above critical micelle concentration | (b) Molecular colloids |
| (iii) White of egg whipped with water | (c) Associated colloid |
| (iv) Soap mixed with water below critical micelle concentration | (d) Macro molecular colloids |
The formation of micelles take place only above
Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient condition is:-
At CMC (Critical micelle concentration) the surface molecules ______.
Differentiate between the following:
Multimolecular Colloid and Macromolecular colloid
For micelle formation, which of the following statements are correct?
- Micelle formation is an exothermic process.
- Micelle formation.is an endothermic process.
- The entropy change is positive.
- The entropy change is negative.
