Which of the following statements is incorrect?

$A$ gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation $\frac{x}{m} = k p^{0.5}$. Adsorption of the gas increases with

Select the correct statement.

Froth floatation process for the concentration of sulphide ores is an illustration of the practical application of

Which one of the following is an incorrect statement for physisorption?

When $O_{2}$ is adsorbed on a metallic surface,electron transfer occurs from the metal to $O_{2}$. The $TRUE$ statement$(s)$ regarding this adsorption is(are)
$(A)$ $O_{2}$ is physisorbed
$(B)$ heat is released
$(C)$ occupancy of $\pi_{2p}^{*}$ of $O_{2}$ is increased
$(D)$ bond length of $O_{2}$ is increased