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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
Differentiate between adsorbtion and absorption.
Why is adsorption always exothermic?
Distinguish between the meaning of the terms adsorption and absorption. Give one example of.
What is the difference between physisorption and chemisorption?
Give reason why a finely divided substance is more effective as an adsorbent.
What are the factors which influence the adsorption of a gas on a solid?
Discuss the effect of temperature on the adsorption of gases on solids.
How does chemisorption vary with temperature?
Answer in one sentence:
Name type of adsorption in which vander Waals focres are present.
Answer in one sentence:
Name type of adsorption in which the compound is formed.
Which of the following is true about chemisorption?
Powdered substances are more effective adsorbents than their crystalline forms because ____________.
Chromatography is based on the principle of ____________.
In physisorption adsorbent does not show specificity for any particular gas because ______.
Why is it important to have clean surface in surface studies?
Why is chemisorption referred to as activated adsorption?
What is the role of activated charcoal in gas mask used in coal mines?
Which of the following statements is incorrect regarding physisorptions?
