Question

Freundlich’s equation for adsorption of gas on solid is represented as

• A. \(\dfrac{m}{x} = kP^n\)
• B. \(\dfrac{x}{m} = kP^n\)
• C. \(\dfrac{m}{x} = kP^{1/n}\)
• D. \(\dfrac{x}{m} = kP^{1/n}\)

Hint:

Freundlich isotherm is valid only over a limited range of pressure.

Answer 1

The Correct Option is D

Step 1: Recall Freundlich adsorption isotherm.
Freundlich adsorption isotherm is an empirical relation describing adsorption of gases on solids at constant temperature.

Step 2: Write the equation.
\[ \frac{x}{m} = kP^{1/n} \] where \(x\) is the mass of gas adsorbed, \(m\) is mass of adsorbent, \(P\) is pressure, and \(k,n\) are constants.

Step 3: Identify the correct form.
The correct mathematical form matching Freundlich’s equation is option (D).

Step 4: Conclusion.
Freundlich’s adsorption equation is \(\dfrac{x}{m} = kP^{1/n}\).