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प्रश्न
What are lyophilic and lyophobic colloids ? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?
उत्तर
Lyophillic colloids: It is made up of two words; ‘Lyo’ meaning liquid and ‘Phillic’ meaning loving, so those colloids which are attracted by the liquid (solvent), are called as lyophillic colloids. These are also called reversible sols. These are quite stable and cannot be easily coagulated.
Lyophobic colloids: It is made up of two words; ‘Lyo’ meaning liquid and ‘Phobic’ meaning repelling, so those colloids which are repelled by the liquid ( solvent), are called as lyophobic colloids. These are also called irreversible sols and these are unstable and can be easily coagulated due to lack of protecting layer around charged colloidal particles, they easily form cluster. Hence, they got easily coagulated on addition of small amount of electrolyte.
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संबंधित प्रश्न
Define the following terms: Lyophilic colloid
Write a method by which lyophobic colloids can be coagulated.
Out of sulphur sol and proteins, which one form multimolecular colloids?
Give reasons for the following observations: Lyophilic sol is more stable than lyophobic sol.
How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?
What are lyophilic and lyophobic sols? Give one example of each type. Why are hydrophobic sols easily coagulated?
How are colloids classified on the basis of Physical states of components
What happens when gelatin is mixed with gold sol?
Match the items given in Column I and Column II.
| Column I | Column II |
| (i) Protective colloid | (a) \[\ce{FeCl3 + NaOH}\] |
| (ii) Liquid-liquid colloid | (b) Lyophilic colloids |
| (iii) Positively charged colloid | (c) Emulsion |
| (iv) Negatively charged colloid | (d) \[\ce{FeCl3}\] + hot water |
Movement of dispersion medium under the influence of electric field is known as ______.
