# A gas undergoes physical adsorption on a surface and follows the given Freundlichadsorption isotherm equation$\frac{x}{m}=kp^{0.5}$Adsorption of the gas increases with: Option 1)Decrease in p and increase in TOption 2)Decrease in p and decrease in TOption 3)Increase in p and decrease in TOption 4)Increase in p and increase in T

$\frac{x}{m}=kp^{0.5}$

$=>$ Adsorption capacity $(\frac{x}{m})$ increases with increase in Pressure.

Now; Physisorption ( Physical adsorption ) is always an exothermic process.

$\therefore$ Adsorption decreases with increase in temperature.

$\therefore$ option (3) is correct.

Option 1)

Decrease in p and increase in T

Option 2)

Decrease in p and decrease in T

Option 3)

Increase in p and decrease in T

Option 4)

Increase in p and increase in T

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