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a
Physical adsorption decreases with increase in temperature.
b
Physical adsorption is multi layered
c
Activation energy of physical adsorption is very high
d
Magnitude of Enthalpy change of physical adsorption is about 20kJ mol-1
answer is C.
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Detailed Solution
Due to weak vanderwaal forces, activation energy of physical adsorbtion is lowAnd the heat of energy released is very low, âHphysisorption=-20KJ/mole