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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?
Why are powdered substances more effective adsorbents than their crystalline forms?
What is the difference between physisorption and chemisorption?
What are the factors which influence the adsorption of a gas on a solid?
Give reasons for the following observations :
Powdered substances are more effective adsorbents.
Which of the following is an example of physisorption?
Which of the following is true about chemisorption?
Adsorption increases when ____________.
In physisorption, adsorption is generally ____________.
The physical adsorption is due to ____________.
Which of the following is not a favourable condition for physical adsorption?
In physisorption adsorbent does not show specificity for any particular gas because ______.
What is the role of activated charcoal in gas mask used in coal mines?
What is the role of adsorption in heterogenous catalysis?
A plot of 10 g (x/m) versus 10 g p for the adsorption of a gas on the surface of a solid gives a straight line with slope equal to:-
Which of the following statements is incorrect regarding physisorptions?
Which of the following statements is not true about physisorption?
