Why physisorption is multi-molecular whereas chemisorption is unimolecular ?
Text Solution
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Chemisorption takes place as a result of the reaction between adsorbent and adsorbate. When the surface of the adsorbent is coverd with one layer, no further reaction can take place. Physisorption is simply by van der Waals forces. So any number of layers may be formed one over the other on the surface of the adsorbent.
Why is chemical adsorption unimolecular while physical adsorption is multimolecular?
Which forms multi molecular layers during adsorption :
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.
Given an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.
