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Question

Which statement is/are correct?

i) Physical adsorption is due to Vander Waal's forces

ii) Physical adsorption decreases at high temperature

iii) Physical adsorption is irreversible

iv) Enthalpy for a chemical adsorption is generally lesser than that of physical adsorption


A

i, ii &iv

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B

i, ii & iii

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C

i, ii

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D

i&iv

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Solution

The correct option is C

i, ii


Physical adsorption is reversible in nature.It takes place by the help of non-covalent attraction between adsorbate and adsorbent making the process reversible. & enthalpy for chemical adsorption is higher than that of physical adsorption


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