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Problem 1 - Olympiad
Which of the following is correct regarding physical adsorption?
A. It increases with an increase in temperature
B. It is highly specific for particular adsorbates
C. It forms a monolayer only
D. It is exothermic due to a decrease in entropy of the system
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Correct: D
Physical adsorption is exothermic as gas molecules are condensed on the surface, reducing randomness (ΔS < 0). The process becomes less favorable at higher temperatures.