Question

Consider the adsorption of gas on the surface of metal. In which of the following condition, will x/m value be proportional to pressure of
the gas on the metal surface?

(a) At high pressure
(b) At low pressure
(c) Providing small surface area
(d) At very high temperature​

Answer 1

Answer:

(d) At very high temperature

Answer 2

Answer:

The correct answer is (b) At low pressure.

At low pressure, the value of x/m is directly proportional to the gas pressure on the metal.

Explanation:

• The adsorption of a gas on the surface of the metal is called Occlusion.
  

• Freundlich's adsorption equation displays the relation between the extent of adsorption $\bold{(\frac{x}{m} )}$ and the adsorbent pressure.
  Here, x is the mass of adsorbate gas. And m is the mass of the adsorbent.
  
                      $\text{At\ low\ pressure} \ \bold{\frac{x}{m}} \propto \bold{P} \ \text{or}\ \bold{\frac{x}{m}} = \bold{KP}$
   
• The equation is an empirical relation between the quantity of gas absorbed (extent of adsorption) and the gas pressure (at low pressure).

To summarize, the extent of adsorption is directly proportional to the pressure when the system is at low pressure.