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In coagulation of a (colloidal) solution...

In coagulation of a (colloidal) solution of `As_2S_3`, which has maximum coagulating power ?

A

NaCl

B

KCl

C

`BaCl_2`

D

`AlCl_3`

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The correct Answer is:
D
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coagultion is the process by which the dispersed phase of a colloid is made to aggregate and thereby separtate from the continuous phase. The minimum concetration of an eletrolyte in milli-moles per litre of the electrolyte solution which required to cause the caogultion of colloidal sol is called coagution value . therefroe higher is the coagulatings power of effective ion, smaller will be the coagultion value of the electrolyte. coagultion value propto = 1/("coagulating power") the coagulation values of differnt electrolytes are different . this behavious can be easily uderstood by Harby - schulze rule which states. the greater is the valency of the effective ion grreater is its coagulating power," which one had the highest coagulating powe?

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JMD PUBLICATION-SURFACE CHEMISTRY-EXAMPLE
  1. The zig-zag motion of colloidal particles was first observed by :

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  2. The colloidal system in which the disperse phase and dispersion medium...

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  3. In coagulation of a (colloidal) solution of As2S3, which has maximum c...

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  4. Blood may be purified by

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  5. Tyndall effect is observed in

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  6. Fog is a colloidal solution of

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  7. Chromatography is based on the principle of : chemical adsorption hyd...

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  8. In collodial state, particle size range from : 10−1000Å, 20−50Å, 1−10Å...

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  9. As2S3 is the example of

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  10. Shape selective catalysis is a reaction catalysed by : Zeolites, Enzym...

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  11. Out of these which colloidal solution is not a lyophilic colloid ?

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  12. Movement of dispersion medium under the influence of electric field is...

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  13. At CMC (Critical Micellisation Conc.) the surface molecules

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  14. Sb2S3 is the example of

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  15. As2S3 is the example of

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  16. Which of the following is a positively charged sol ?

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  17. Rate of physisorption always increases with decrease in temperature. E...

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  18. Adsorption is an exothermic process. Explain.

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  19. In gases, the extent of adsorption always increases with increase in p...

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  20. What is heterogeneous catalysis ? What role does adsorption play in he...

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