The given graphs / data I, II, III and IV represents general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is (are) correct?
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Physisorption involves weak van der Waals forces, decreases with temperature, and is multilayer. Chemisorption involves strong chemical bonds, first increases then decreases with temperature, and is monolayer.
Graph I: Decreases with temperature → Physisorption.
Graph II: First increases then decreases → Chemisorption.
Graph III: Decreases with temperature → Physisorption.
Graph IV: Increases with pressure → Physisorption (as adsorption increases with pressure).
Thus, only I is physisorption and II is chemisorption is correct.
Final answer: I is physisorption and II is chemisorption