Question

In Freundlich adsorption equation $\frac{x}{m}=k{p}^{1/n}$ the value of n is :

• A. always greater than one
• B. always smaller
• C. always equal to one
• D. greater than one at low temperature and smaller than one at high temperature

Answer 1

The correct option is A always greater than one

Freundlich gave an empirical relationship between the quantity of gas adsorbed by a unit mass of solid adsorbent and pressure at a particular temperature. The relationship can be expressed by the following equation:

$⟹$ $\frac{x}{m}=k\times$$(p{)}^{\frac{1}{n}}$

where $x$ is the mass of the gas adsorbed on mass m of the adsorbent at pressure $P,k$ and $n$ are constants which depend on the nature of the adsorbent and the gas at a particular temperature.

Here, the value of n should be always greater than one so as to equation be valid for a range of values.