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Give an example where physisorption changes to chemisorption with rise in temperature.Explain the reason for change.
Answers (1)
If temperature increases, chemical bonds start forming between the adsorbate and adsorbent. It is so because the energy for activation is reached on increasing the temperature. Hence, physisorption of gaseous species may change to chemisorption. At lower temperatures, hydrogen is adsorbed by weaker van der Waals forces to finely divided nickel. However, when the temperature increases, bonds start to form between Nickel and hydrogen.
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