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Q.

Which one of the following is correct regarding physisorption ?

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a

It involves chemical bonds between adsorbent and adsorbate

b

Enthalpy of adsorption is about $80 - 240 k J {m o l}^{- 1}$

c

It is reversible in nature

d

It results in unimolecular layer only on adsorbent surface under high pressure

answer is C.

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Detailed Solution

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Physisorption is also known as physical adsorption and it is an exothermic process. Its adsorption enthalpy is low, nearly 20 to 40 kJ/mol. In physisorption, the gas is accumulated on the solid surface due to weak forces known as Van der Waals forces, and it is reversible in nature.

Hence the correct answer is (C).

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