Adsorption is always

The charcoal maintained at $100 \ K$ absorbs

Assertion : The relation $\frac{x}{m} = k \cdot p^{1/n}$ is known as Freundlich adsorption isotherm,where $x$ is the mass of gas adsorbed by $m$ grams of adsorbent,$p$ is the equilibrium pressure,$k$ and $n$ are constants for a given system and temperature.
Reason : When several substances have the same value of $\frac{1}{n}$,the lines by which their adsorption isotherms can be represented will meet at a point.

Which of the following is $NOT$ a characteristic of chemisorption?

In Freundlich adsorption isotherm,the value of $1/n$ is

Which of the following statements is false during the adsorption of gas molecules on a metal surface?