Of which, the physisorption enthalpy is the highest??
A. H2

Dear Student,

For physical adsorption, enthalpy of adsorption are of the order of enthalpy of vapourisation. 
Enthalpy of vapourisation depends on intermolecular forces between particles. Greater the forces between molecules, greater is the enthalpy of vapourisation. 
Amongst the given compounds, H2O has strongest intermolecular forces, therefore, it will have maximum enthalpy of vapourisation. 
Therefore, it will have highest enthalpy of physisorption. 

Hence, correct answer is (B)

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