Why is adsorption phenomenon always exothermic
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• This causes a decrease in the surface energy of the adsorbent. Therefore, adsorption is always exothermic.
• ΔH of adsorption is always negative. When a gas is adsorbed on a solid surface, its movement is restricted leading to a decrease in the entropy of the gas i.e., ΔS is negative.
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During adsorption, energy is released due to presence of attraction between adsorbate and adsorbent molecules. Hence, adsorption is an exothermic process.
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