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प्रश्न
How are colloids classified on the basis of interaction between the dispersed phase and the dispersion medium?
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उत्तर
The classification of colloids as lyophilic (solvent attracting) and lyophobic (solvent repelling) is based on the nature of the interaction between the dispersed phase and the dispersion medium.
(a) Lyophilic colloids (solvent-loving):
- These substances have a strong affinity for the dispersion medium and readily form colloidal solutions when mixed.
- Examples include proteins, starch, rubber, gelatin, gum, etc.
- These sols are quite stable due to strong attractive forces between dispersed particles and the medium.
- Lyophilic sols are reversible and do not require stabilizers.
(b) Lyophobic colloids (solvent-hating):
- These substances do not readily form sols with the dispersion medium due to lack of affinity.
- Examples include sols of metals like gold, platinum, and insoluble substances like metal sulphides.
- These sols are less stable, require special preparation techniques and stabilizers, and are irreversible.
संबंधित प्रश्न
What are lyophilic and lyophobic colloids ? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?
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.
Define the following term:
Multimolecular colloids
How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?
Why are hydrophobic sols easily coagulated?
How are colloids classified on the basis of Physical states of components
How are colloids classified on the basis of the nature of the dispersion medium?
Which of the following interface cannot be obtained?
Method by which lyophobic sol can be protected?
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 ______.
Differentiate between the following:
Lyophobic Sol and Lyophilic Sol
