Advertisements
Advertisements
प्रश्न
Discuss the effect of temperature on the adsorption of gases on solids.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Write the differences between physisorption and chemisorption with respect to the following:
(i) Specificity
(ii) Temperature dependence
(iii) Reversibility and
(iv) Enthalpy change
Why is adsorption always exothermic?
Why are powdered substances more effective adsorbents than their crystalline forms?
What is the difference between physisorption and chemisorption?
Physisorption is reversible while chemisorption is irreversible. Why ?
How does chemisorption vary with temperature?
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 ____________.
The physical adsorption is due to ____________.
Which of the following is not a favourable condition for physical adsorption?
Physical adsorption of a gaseous species may change to chemical adsorption with ______.
Why is chemisorption referred to as activated adsorption?
Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.
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.
