Question
Download Solution PDFWhich of the following is not the characteristic of physisorption?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Enthalpy of adsorption is high - is NOT a characteristic of physisorption.
- Adsorption - The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid.
- Two types of adsorption of gases on solids - Physisorption (physical adsorption) and Chemisorption (chemical adsorption).
- Physisorption (physical adsorption) - When the accumulation of gas on the surface of a solid occurs on account of weak van der Waals' forces.
- Chemisorption (chemical adsorption) - When the gas molecules or atoms are held to the solid surface by chemical bonds.
In physisorption, enthalpy of adsorption is low ( 20- 40 kJ mol–1 ) whereas in the case of chemisorption enthalpy of adsorption is high (80 – 240 kJmol–1 )
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