Among the following the number of curves not in accordance with Freundlich adsorption isotherm is

Freundlich, in 1909, gave an empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature. The relationship can be expressed by the following equation

$\frac{\mathrm{X}}{\mathrm{m}}={\mathrm{KP}}^{\frac{1}{\mathrm{n}}}$

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. The relationship is generally represented in the form of a curve where mass of the gas adsorbed per gram of the adsorbent is plotted against pressure.

$\log \frac{\mathrm{x}}{\mathrm{m}}=\frac{1}{\mathrm{n}}\mathrm{logp}+\mathrm{logk}$

Freundlich isotherm explains the behaviour of adsorption in an approximate manner. The factor $\frac{1}{\mathrm{n}}$ can have values between 0 and 1