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A gas undergoes physical adsorption on a surface and follows the given Freundlich

adsorption isotherm equation

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

Adsorption of the gas increases with: 

  • 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

Answers (1)

best_answer

Freundlich adsorption isotherm equation:

\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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