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

What Modification Can You Suggest in the Hardy-schulze Law?

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प्रश्न

What modification can you suggest in the Hardy-Schulze law?

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उत्तर

Hardy-Schulze law states that ‘the greater the valence of the flocculating ion added, the greater is its power to cause precipitation.

This law takes into consideration only the charge carried by an ion, not its size. The smaller the size of an ion, the more will be its polarising power. Thus, Hardy-Schulze law can be modified in terms of the polarising power of the flocculating ion. Thus, the modified Hardy-Schulze law can be stated as ‘the greater the polarising power of the flocculating ion added, the greater is its power to cause precipitation.

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संबंधित प्रश्न

What is the reason for the stability of colloidal sols?


Out of MgCl2 and AlCl3, which one is more effective in causing coagulation of negatively charged sol and why?


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


Define the following term : Brownian movement


What happens when an emulsion is centrifuged?


Answer the following question.
Why are medicines more effective in the colloidal state?


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 does leather get hardened after tanning?


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

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Reason: Brownian motion is responsible for stability of sols.


Give reason for the following:

Lyophilic colloidal solutions are more stable than lyophobic colloidal solutions.


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Tyndall effect is observed in


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


State the Hardy-Schulze rule.


Define the following term:

Coagulation


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:


Coagulation value of the electrolytes AlCl3 and NaCl for As2S3 sol are 0.093 and 52 respectively. The No. of times AlCl3 has greater coagulating power than NaCl is ______.


6.84 g Al2(SO4)3 is needed to coagulate 2.5 L of As2S3 sol completely in 2.0 hrs. The coagulation value of Al2 (SO4)3 is ______.


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