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प्रश्न
What is the reason for the stability of colloidal sols?
Write the main reason for the stability of colloidal sols.
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उत्तर १
Reasons for the stability of colloidal sols:
a. Coagulation of the colloidal sol is prevented because of the presence of equal and similar charges on the colloidal particles.
b. Colloidal particles are covered by a sheath of liquid in which they are extensively solvated because of which they acquire stability.
उत्तर २
There are two main reasons for the stability of colloidal sols:
1. Electrostatic stabilisation: Presence of equal and similar charges on the colloidal particles prevents coagulation of the colloidal sol.
2. Solvation: Colloidal particles are covered by a sheath of liquid in which they are extensively solvated, thereby providing stability.
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संबंधित प्रश्न
Out of BaCl2 and KCl, which one is more effective in causing coagulation of a negatively charged colloidal Sol? Give reason.
Explain what is observed when a beam of light is passed through a colloidal sol.
Explain what is observed when an electrolyte NaCl is added to hydrated ferric oxide sol.
Explain what is observed when an electric current is passed through a colloidal sol?
A colloidal sol is prepared by the given method in the figure. What is the charge on hydrated ferric oxide colloidal particles formed in the test tube? How is the solution represented?
Which of the following statements are correct?
(i) Mixing two oppositely charged sols neutralises their charges and stabilises the colloid.
(ii) Presence of equal and similar charges on colloidal particles provides stability to the colloids.
(iii) Any amount of dispersed liquid can be added to emulsion without destabilising it.
(iv) Brownian movement stabilises sols.
Which of the following is used for removing change on colloidal solution?
Define coagulation.
What is electrophoresis?
The conditions given below are in the context of observing Tyndall effect in colloidal solutions:
- The diameter of the colloidal particles is comparable to the wavelength of light used.
- The diameter of the colloidal particles is much smaller than the wavelength of light used.
- The diameter of the colloidal particles is much larger than the wavelength of light used.
- The refractive indices of the dispersed phase and the dispersion medium are comparable.
- The dispersed phase has a very different refractive index from the dispersion medium.
Choose the most appropriate conditions from the options given below:
