Question

If $x$ is amount of adsorbate and $m$ is amount of adsorbent, which of the following relations is not related to adsorption process?

• A. $\frac{x}{m}=f\left(T\right)$ at constant $P$
• B. $P=f\left(T\right)$ at constant $\left(\frac{x}{m}\right)$
• C. $\frac{x}{m}=P\times T$
• D. $\frac{x}{m}=f\left(P\right)$ at constant $T$

Answer 1

The correct option is C $\frac{x}{m}=P\times T$

Freundlich adsorption isotherm can be expressed by the equation

$\frac{x}{m}=k{p}^{1/n}$

The Langmuir adsorption isotherm can be expressed by the equation

$\frac{x}{m}=\frac{bp}{l+ap}$

Adsorption isotherms and adsorption Isobars are plotted only when either temperature or pressure is kept constant.

It can not be plotted when none of the pressure or temperature is constant.

Hence, option $\text{C}$ is not related to the adsorption process.