Question

Adsorption of a gas on a surface follows Freundlich adsorption isotherm. Plot of, $\log \frac{x}{m}$ versus log p gives a straight line with slope equal to 0.5, then: ($\frac{x}{m}$ is the mass of the gas adsorbed per gram of adsorbent)

• A. adsorption is proportional to the pressure.
• B. adsorption is proportional to the square of pressure.
• C. adsorption is independent of pressure.
• D. adsorption is proportional to the square root of pressure.

Answer 1

The correct option is D adsorption is proportional to the square root of pressure.

$\log \frac{x}{m}=\frac{1}{2}\log p+8$

comparing with ,

$\log \frac{x}{m}=\frac{1}{n}\log p+\log k$

$n=2$

$\therefore \frac{x}{m}\alpha p^{1/2}$