The correct option representing a Freundlich adsorption isotherm is

According to Freundlich adsorption isotherm, $\frac{\mathrm{x}}{\mathrm{m}}=\mathrm{kp}^{1 / \mathrm{n}}$where, $\frac{\mathrm{x}}{\mathrm{m}}=$ amount of the gas adsorbed per unit mass of adsorbent $\mathrm{p}=$ pressure $\mathrm{k}$ and $\mathrm{n}=$ constants. The value of $\mathrm{n}$ lies in between 0 to 1 . Thus, $\frac{\mathrm{x}}{\mathrm{m}}=\mathrm{kp}^{0.3}$ and option (1) is correct.