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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 a surface phenomenon where molecules from a gas, liquid, or dissolved solid adhere to the surface of a solid or liquid. This results in a higher concentration of molecules at the surface compared to the bulk. 2. **Understanding Surface Energy**: - When adsorption occurs, the molecules that adhere to the surface experience a change in energy. The energy associated with the surface is known as surface energy. ...
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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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