There are certain properties related to adsorption I. Reversible II. Formation of unimolecular l...

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There are certain properties related to adsorption
I. Reversible
II. Formation of unimolecular layer
III. Low heat of adsorption
IV. Occurs at low temperature and decreases with increase in temperature
Which of the above properties are for physical adsorption?
(a) I, II, III
(b) I, III, IV
(c) II, III, IV
(d) I, III
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