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Question
Write a method by which lyophobic colloids can be coagulated.
Solution
Lyophobic colloids can be coagulated by the electrophoresis method. The colloidal particles move towards the oppositely charged electrodes, get discharged and precipitated.
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RELATED QUESTIONS
What are lyophilic and lyophobic colloids ? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?
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?
How are colloids classified on the basis of Interaction between dispersed phase and dispersion medium?
Which of the following interface cannot be obtained?
Method by which lyophobic sol can be protected?
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(i) Lyophobic colloids.
(ii) Irreversible colloids.
(iii) Reversible colloids.
(iv) Lyophilic colloids.
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 |
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Lyophobic Sol and Lyophilic Sol
