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Adsorption: physisorption vs chemisorption, Freundlich and Langmuir isotherms
JEE Main level
One or more correct options
Difficulty 2 of 3
sc030
Which of the following statements about chemisorption are correct?
A
Its enthalpy of adsorption is lower than that of physisorption
B
It generally requires some activation energy
C
It is specific to particular gas-surface combinations
D
It occurs readily as multilayers at high pressure
Answer: B, C
Chemisorption forms chemical bonds, so it has a high enthalpy (not lower), needs activation energy and is specific. It is limited to a monolayer.
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