Mass Transfer
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

Differential heat of adsorption
Heat of wetting
Integral heat of adsorption
None of these

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Mass Transfer
An example of elutioh is

Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank
Recovery of vegetable oils from seeds
Separation of sugar from sugar beet by hot water
Dissolution of tannin out of tree barks by water

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