Question

Which of the following is the correct adsorpation isobar for physisorption?
Here, $\left(\frac{x}{m}\right)$ is extent of adsorption per unit mass of adsorbent.

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Adsorption Isobar:
The variation in the amount of gas adsorbed by the adsorbent with temperature at constant pressure. It can be expressed by a curve termed as adsorption isobar.
At constant pressure $P$,
$x$ is the mass of the gas adsorbed.
$M$ is the mass of adsorbent.
$\left(\frac{x}{m}\right)$ is extent of adsorption per unit mass of adsorbent.
For physisorption, with increase in temperature, physical adsorption decrease continuously.
Hence the curve obtained is: