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प्रश्न
Why is adsorption always exothermic?
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उत्तर
ΔH is always negative because during adsorption, the surface energy decreases in the form of heat. Furthermore, ΔS is negative because when a gas is adsorbed on a solid surface, its movement is restricted; this leads to a decrease in the entropy of the gas. Now, for a process to be spontaneous, ΔG should be negative.
∴ ΔG = ΔH − TΔS
Because ΔS is negative, TΔS becomes positive. Therefore, ΔH has to be highly negative for the spontaneous process to make ΔG negative. Hence, adsorption is always exothermic.
संबंधित प्रश्न
Differentiate between adsorbtion and absorption.
Write one similarity between Physisorption and Chemisorption
How does chemisorption vary with temperature?
Which of the following is true about chemisorption?
The physical adsorption is due to ____________.
Extent of physisorption of a gas increases with ______.
In physisorption adsorbent does not show specificity for any particular gas because ______.
Why do physisorption and chemisorption behave differently with rise in temperature?
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:-
Adsorption play no role in:-
