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What happens when a lyophilic sol is added to a lyophobic sol? (i) Lyophobic sol is protected. (ii) Lyophilic sol is protected. (iii) Film of lyophilic sol is formed over lyop - Chemistry

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प्रश्न

What happens when a lyophilic sol is added to a lyophobic sol?

(i) Lyophobic sol is protected.

(ii) Lyophilic sol is protected.

(iii) Film of lyophilic sol is formed over lyophobic sol.

(iv) Film of lyophobic sol is formed over lyophilic sol.

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उत्तर

(i) Lyophobic sol is protected.

(iii) Film of lyophilic sol is formed over lyophobic sol.

Explanation:

Lyophilic colloids have a unique property of protecting lyophobic colloids. When a lyophilic sol is added to the lyophobic sol, the lyophilic particles form a layer around lyophobic particles and thus protect the latter from electrolytes. Lyophilic colloids used for this purpose are called protective colloid.

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अध्याय 5: Surface Chemistry - Exercises [पृष्ठ ६९]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 12
अध्याय 5 Surface Chemistry
Exercises | Q II. 34. | पृष्ठ ६९

संबंधित प्रश्न

Define the following terms: Associated colloids


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Explain what is observed when an electrolyte NaCl is added to hydrated ferric oxide sol.


Explain the terms Coagulation


Explain the terms Dialysis 


What happens when persistent dialysis of a colloidal solution is carried out?


What happens when an emulsion is centrifuged?


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.


How does it become possible to cause artificial rain by spraying silver iodide on the clouds?


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
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(iv) Solvent molecules pass through semi permeable
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Reason: Brownian motion is responsible for stability of sols.


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The important factor in the stabilization of a colloidal solution is ______


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What is electrophoresis?


Which of the following is a correct statement?


The conditions given below are in the context of observing Tyndall effect in colloidal solutions:

  1. The diameter of the colloidal particles is comparable to the wavelength of light used.
  2. The diameter of the colloidal particles is much smaller than the wavelength of light used.
  3. The diameter of the colloidal particles is much larger than the wavelength of light used.
  4. The refractive indices of the dispersed phase and the dispersion medium are comparable.
  5. The dispersed phase has a very different refractive index from the dispersion medium.

Choose the most appropriate conditions from the options given below:


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