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Questions
What happens when gelatin is mixed with gold sol?
What happens when gelatin is added to gold sol?
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Solution
When gelatin is mixed with (or added to) gold sol, it forms a protective layer around the gold particles, which prevents coagulation. This stabilizes the gold sol. Gelatin acts as a protective colloid and is a lyophilic sol.
RELATED QUESTIONS
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?
Which of the following colloids cannot be coagulated easily?
(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 |
Differentiate between the following:
Lyophobic Sol and Lyophilic Sol
