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a
Adsorption always led to a decrease in enthalpy of the system
b
Adsorption arises due to unbalanced or residual attractive force of atoms or molecule or the surface
c
Adsorption increases with rises in temperature
d
Adsorption decreases the surface energy
answer is A.
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Detailed Solution
Rate of adsorption decreases whenever temperature is increases. This due to the fact that, when temperature is increases, the kinetic energy of adsorbed molecules gets increased and they overcome the electrostatic force of attraction by the adsorbent surface. Physisorption is exothermic in nature.