Question:
Select the graph that correctly describes the adsorption isotherms at two temperatures $T_{1}$ and $T_{2}$ $\left(\mathrm{T}_{1}>\mathrm{T}_{2}\right)$ for a gas :
$(\mathrm{x}-$ mass of the gas adsorbed ; $\mathrm{m}-$ mass of adsorbent; P-pressure)
Correct Option: , 4
Solution:
$\frac{\mathrm{x}}{\mathrm{m}} \alpha \mathrm{P}^{1 / \mathrm{n}}\left(0<\frac{1}{\mathrm{n}}<1\right)$
On Increasing temperature $\frac{x}{m}$ decreases.
$\because$ adsorption is generally exothermic
