13. When the temperature is lowered and pressure is raised,
the physisorption of a gas on a solid surface generally
(1) Decreases
(2) Increases
(3) Remains unaffected
(4) Decreases first then increases
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the answer is decreases
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An increase in pressure decreases the volume of gas and thus increases the adsorption of gas molecules. Conversely, a decrease in pressure will cause the removal of gas molecules from the solid surface. Increase in temperature increases physisorption.
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