Question

According to Freundlich isotherm, the above graph will be true when:

• A. $P=0$
• B. $P=1$
• C. $\frac{1}{n}=0$
• D. $\frac{1}{n}=\infty$

Answer 1

The correct option is C $\frac{1}{n}=0$

Freundlich adsorption gives the variation in the quantity of gas adsorbed by a unit mass of solid adsorbent with the change in pressure of the system for a given temperature. The expression for the Freundlich isotherm can be represented by the following equation:
$\frac{x}{n}=k{P}^{\frac{1}{n}}$

where $n>1$

Where $x$ is the mass of the gas adsorbed, $m$ is the mass of the adsorbent, $P$ is the pressure and $n$ is a constant which depends upon the nature of adsorbent and the gas at a given temperature.

Generally according to Freundhlich adsorption theory, at high pressure $\frac{1}{n}$ value tends to $0$ and hence the amount of adsorbed becomes independent of pressure.
So, above graph is valid if $\frac{1}{n}=0$ and high pressure.
So the answer is option (c).