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प्रश्न
Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.
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उत्तर
The process of physisorption for example that of H2 on finely divided nickel, involves weak van der Waals’ forces. With increase in temperature, hydrogen molecules dissociate into hydrogen atoms which are held on the surface by chemisorption.
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संबंधित प्रश्न
Give reasons for the following observations:
Physisorption decreases with increase in temperature.
What is the effect of temperature on chemisorption ?
Why is adsorption always exothermic?
Write any two characteristics of chemisorption.
Why are powdered substances more effective adsorbents than their crystalline forms?
Distinguish between the meaning of the terms adsorption and absorption. Give one example of.
What are the factors which influence the adsorption of a gas on a solid?
How does chemisorption vary with temperature?
How does chemisorption vary with temperature?
Answer in one sentence:
Name type of adsorption in which the compound is formed.
Powdered substances are more effective adsorbents than their crystalline forms because ____________.
Extent of physisorption of a gas increases with ______.
In physisorption adsorbent does not show specificity for any particular gas because ______.
Why is it important to have clean surface in surface studies?
In physical adsorption, gas molecules are bound on the solid surface by
Chromatography is based on:-
Assertion A : Activated charcoal adsorbs SO2 more efficiently than CH4.
Reason R : Gases with lower critical temperatures are readily adsorbed by activated charcoal.
In light of the above statements, choose the correct answer from the options given below.
