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प्रश्न
What happens when an emulsion is centrifuged?
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उत्तर
An emulsion is centrifuged because it is a colloidal dispersion. Also, it exhibits all the properties shown by colloidal sols, that is, Tyndall effect, Brownian movement, electrophoresis, etc.
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संबंधित प्रश्न
What is the reason for the stability of colloidal sols?
Define the following term : Brownian movement
Explain what is observed when a beam of light is passed through a colloidal sol.
Explain the term Tyndall effect.
Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?
(i) Reverse osmosis takes place.
(ii) Electroosmosis takes place.
(iii) Dispersion medium begins to move.
(iv) Dispersion medium becomes stationary.
Why do we add alum to purify water?
Match the statement given in Column I with the phenomenon given in Column II.
| Column I | Column II |
| (i) Dispersion medium moves in an electric field | (a) Osmosis |
| (ii) Solvent molecules pass through semi permeable membrane towards solvent side |
(b) Electrophoresis |
| (iii) Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes |
(c) Electroosmosis |
| (iv) Solvent molecules pass through semi permeable membranes towards solution side |
(d) Reverse osmosis |
Assertion: An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles.
Reason: Pore size of the filter paper becomes more than the size of colloidal particle.
Assertion: Colloidal solutions do not show brownian motion.
Reason: Brownian motion is responsible for stability of sols.
Tyndall effect is observed in
