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Physisorption

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Physisorption

Physical adsorption is a system used to portray the surface and pore features of solids, that is, the surface of the material. The adsorption isotherm produced by the Physical Adsorption procedure enables one to portray a solids' surface by deciding its surface area, porosity, and complete pore volume.

It is the physical bonding of gas molecules to the surface of a solid or fluid that the gas comes into interaction with at low temperatures. It happens because of Van der Waals forces. The weak bonding is not surface-specific and takes place between all gas molecules on any surface. The process, which does not include any surface reaction, is accomplished rapidly at low temperatures. However, surface inclusion reduces with a rise in temperature. Physisorption is used when evaluating the total surface area and in pore size analysis of mesopores, micropores and nanopores.

What is Adsorption?

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Which of the following statements is not true? a. Both physisorption and chemisorption are exothermic. b. Physisorption occurs with increase of free energy. c. Physisorption requires low activation energy but chemisorption requires high activation energy. d. The magnitude of chemisorption increases and that of physisorption decreases with rise in temperature.

The correct statements pertaining to the adsorption of a gas on a solid surface are (i) Adsorption is always exothermic (ii) Physisorption may transform into chemisorption at high temperature (iii) Physisorption increases with increasing temperature but chemisorotion decrease with increasing temperature (iv) Chemisorption is more exothermic than physisoption, however, it is very slow due to higher energy of activation

In a particular case of physisorption, magnitude of enthalpy change and entropy change were observed to be 28 kJ/mole and 100 J/mole-K. Calculate the minimum temperature (in .^(@)C ) above which physisorption will become non spontaneous.

Fill in the blanks by putting appropriate choices. During adsorption there is _______ in enthalpy and _______ in the entropy of a system by adsorption is a spontaneous process and thus DeltaG must be ________. Rate of physisorption ________ with increase in pressure.