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Why is adsorption always exothermic ?...

Why is adsorption always exothermic ?

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### Step-by-Step Solution: 1. **Definition of Adsorption**: - Adsorption is the process in which atoms, ions, or molecules from a gas, liquid, or dissolved solid adhere to a surface of a solid or liquid (known as the adsorbent). 2. **Interaction Between Adsorbent and Adsorbate**: - During adsorption, there is a significant interaction between the adsorbent (the surface) and the adsorbate (the substance being adsorbed). This interaction can be physical (physisorption) or chemical (chemisorption). ...
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Knowledge Check

  • The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are) (i) adsorption is always exothermic (ii) physisorption may transform into chemsisorption transform into chemisorption at high temperature (iii) physisorption increases with increasing temperature but chemisorption decreases with increasing temperature . (iv) chemisorption is more exothermic than physisorption , however it is very slow due to higher energy of activation.

    A
    (i) and (iv) only
    B
    (ii) and (iii) only
    C
    (i),(ii) and (iv) only
    D
    All of these.

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