JEE Main 2016 Chemistry question

Not in JEE Main or NEET syllabus

A particular adsorption process has the following characteristics: (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process:

(1)Adsorption is monolayer
(2)Adsorption increases with increase in temperature
(3)Enthalpy of adsorption is greater than 100 kJ mol
(4)Energy of activation is lowCorrect

Answer: (4)

Solution

Van der Waals forces and reversibility together identify the process as **physical adsorption** (physisorption). Its characteristics follow from the weakness and non-specificity of those forces: no chemical bond has to be made or broken, so the process needs little or **no activation energy** — option (4). The other

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Question ID VK-115541