1.

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

Answer»

DECREASE in temperature
increase in temperature
increase in surface area of adsorbent
decrease in surface area of adsorbent

Solution :At HIGHER temperature, gaseous MOLECULES may DISSOCIATE into atoms which are then chemisorbed, e.g., `N_2` GAS on iron surface at temperature above 773 K.


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