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

(a) decrease in temperature
(b) increase in temperature
(c) increase in surface area of the adsorbent
(d) decrease in surface area of the adsorbent

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(b) increase in temperature

At high temperatures, gaseous species may dissociate into atoms that are chemisorbed, eg: N2 an iron surface at ≥ 773 K.

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