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How is adsorption of a gas related to it...

How is adsorption of a gas related to its critical temperature?

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Higher is the critical temperature of a gas, greater are the van der Waals forces of attraction and hence greater the adsorption.
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During the adsorption of krypton on activated charcoal at low temperature

The essential conditions for liquefaction of gases were discovered by Andrews in 1869 as a result of his study of pressure-volume-temperature relationship for CO_(2) . It was found that above a certain temperature, it was impossible to liquefy a gas whatever the pressure was applied. The temperature below which the gas can be liquefied by the application of pressure alone is called critical temperature (Tc). The pressure required to liquefy a gas at this temperature is called the critical pressure (Pc). The volume occupied by one mole of the substance at the critical temperature and pressure is called critical volume. Critical constants are related with van der waals' constant as follows: V_( c) = 3b, P_( c) =a/(27b^(2)), T_( c) =(8a)/(27 Rb) The values of critical volumes of four gases A, B, C and D are 0.025L, 0.312L, 0.245L and 0.432L respectively. The gas with larger molecular diameter will be :

ICSE-SURFACE CHEMISTRY -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (VERY SHORT ANSWER QUESTIONS)
  1. Why activated charcoal is a better adsorbent than ordinary charcoal ?

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  2. How will you prove the selective nature of adsorption ?

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  3. How is adsorption of a gas related to its critical temperature?

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  4. Out of the following gases which will be adsorbed more readily on the ...

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  5. Why is ferric chloride preferred over potassium chloride in case of a ...

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  6. What happens when a colloidal sol of Fe(OH)3 is mixed with that of As2...

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  7. What happens when persistent dialysis of a colloidal solution is carri...

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  8. What happens when a beam of light is passed through As2S3 sol?

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  9. KCl is added to Fe(OH)3 sol?

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  10. What is the main cause of charge on a colloidal solution?

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  11. How are gold number and protective power of colloid related?

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  12. What is demulsification ?

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  13. Give four uses of emulsions.

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  14. What are micelles ? Give an example of a micellers system.

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  15. How does soap help in washing clothes?

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

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  17. Why is it essential to wash the precipitate with water before estimati...

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  18. Why lyophilic colloidal sols are more stable than lyophobic colloidal ...

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  19. How can a colloidal solution be distinguished from the true solution o...

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  20. Colloidal solution can be made in water and in air as media. What dist...

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