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Physical adsorption of a gaseous species may change to chemical adsorption with:

1. decrease in temperature
2. increase in temperature
3. increase in surface area of adsorbent
4. decrease in surface area of adsorbent

Correct answer: increase in temperature

Solution

Physical adsorption is weak and favored at lower temperatures, while chemical adsorption involves stronger bond formation and often needs activation energy. Increasing temperature can promote the transition from physisorption to chemisorption.

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