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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Assertion: Colloidal solutions show colligative properties. Reason: Colloidal particles are large in size. - Chemistry

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प्रश्न

Assertion: Colloidal solutions show colligative properties.

Reason: Colloidal particles are large in size.

विकल्प

  • Assertion and reason both are correct and the reason is correct explanation of assertion.

  • Assertion and reason both are correct but reason does not explain assertion.

  • Assertion is correct but reason is incorrect.

  • Both assertion and reason are incorrect.

  • Assertion is incorrect but reason is correct.

MCQ
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उत्तर

Assertion and reason both are correct but reason does not explain assertion.

Explanation:

Colloidal particles are large in size and hence the number of particle is lesser than the true solution. The lesser number of particles causes lower colligative properties.

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अध्याय 5: Surface Chemistry - Exercises [पृष्ठ ७३]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 12
अध्याय 5 Surface Chemistry
Exercises | Q 74 | पृष्ठ ७३

संबंधित प्रश्न

Out of BaCl2 and KCl, which one is more effective in causing coagulation of a negatively charged colloidal Sol? Give reason.


Give reasons for the following observations: Leather gets hardened after tanning.


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?


Explain the terms Coagulation


Explain the terms Dialysis 


What happens when a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution?


What happens when an emulsion is centrifuged?


The values of colligative properties of colloidal solution are of small order in comparison to those shown by true solutions of same concentration because of colloidal particles ______.


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.


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: Coagulation power of Al3+ is more than Na+.

Reason: Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy Schulze rule).


Give reason for the following:

Lyophilic colloidal solutions are more stable than lyophobic colloidal solutions.


What is common in aqua sols and solid aerosols? How do they differ?


State the Hardy-Schulze rule.


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:


Lyophilic sols are more stable than lyophobic sols because ______.


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