Question

Which of the following is correct adsorption isobar for chemisorption ?
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 B

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 chemisorption,
As the temperature increases, chemical adsorption increases initially, reaches a maximum, then decreases continuously.
The curve obtained is: