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प्रश्न
Discuss the effect of temperature on the adsorption of gases on solids.
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उत्तर
Adsorption is generally exothermic; hence, increasing temperature decreases adsorption. In physical adsorption, a rise in temperature weakens van der Waals forces, lowering adsorption. For chemical adsorption, it first increases with temperature due to activation energy requirements, then decreases at higher temperatures as desorption dominates. Thus, the effect of temperature depends on the type of adsorption.
संबंधित प्रश्न
Give reasons for the following observations:
Physisorption decreases with increase in temperature.
Differentiate between adsorbtion and absorption.
Physisorption is reversible while chemisorption is irreversible. Why ?
How does chemisorption vary with temperature?
Which of the following compounds is formed when tungsten adsorbs oxygen gas?
Which among the following is a property of physisorption?
Powdered substances are more effective adsorbents than their crystalline forms because ____________.
Chromatography is based on the principle of ____________.
Extent of physisorption of a gas increases with ______.
Which of the following is not a favourable condition for physical adsorption?
Physical adsorption of a gaseous species may change to chemical adsorption with ______.
In physisorption adsorbent does not show specificity for any particular gas because ______.
Why is it important to have clean surface in surface studies?
Why do physisorption and chemisorption behave differently with rise in temperature?
Which among the following is a false statement?
In physical adsorption, gas molecules are bound on the solid surface by
Rate of physisorption increase with:-
Which of the following statements is incorrect regarding physisorptions?
Which of the following statements is not true about physisorption?
