The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the
Options:
A .  differential heat of adsorption.
B .  heat of wetting.
C .  integral heat of adsorption.
D .  none of these.
Answer: Option A Answer: (a).differential heat of adsorption.
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