Adsorption Isotherm

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

1. $\frac{\mathrm{x}}{\mathrm{m}}=\mathrm{f}\left(\mathrm{T}\right)$ $\mathrm{at}$ $\mathrm{constant}$ $\mathrm{P}$

2. $\mathrm{p}=\mathrm{f}\left(\mathrm{T}\right)$ $\mathrm{at}$ $\mathrm{constant}$ $\left(\mathrm{x}/\mathrm{m}\right)$

3. $\frac{\mathrm{x}}{\mathrm{m}}=\mathrm{p}\backslash times\mathrm{T}$

4. $\frac{\mathrm{x}}{\mathrm{m}}=\mathrm{f}\left(\mathrm{p}\right)$ $\mathrm{at}$ $\mathrm{constant}$ $\mathrm{T}$

In the Freundlich adsorption isotherm, the value of 1/n is:
1. Between 0 and 1 in all cases.
2. Between 2 and 4 in all cases.
3. 1 in the case of physical adsorption.
4. 1 in the case of chemisorption.