Adsorption is accompanied by the evolution of heat, so according to Le-Chatelier's principle, the amount of substance adsorbed should:
Increases with a decrease in temperature
Increases with an increase in temperature
Decreases with a decrease in temperature
Is independant of the temperature
According to Le-Chatelier's principle, exothermic reactions are favoured at low temperature.
Hence, increasing the temperature will decrease the extent of adsorption and decreasing the temperature will lead to an increase in the extent of adsorption.
Therefore, the option number (1) is correct.
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