Question

In the adsorption of a gas on solid, Freundlich isotherm is obeyed. The slope of the plot is zero. Thus, the extent of adsorption is

• A. Directly proportional to the pressure of gas
• B. Inversely proportional to the pressure of the gas
• C. Independent of the pressure of the gas
• D. Proportional to the square of the pressure of the gas.

Answer 1

Answer: (C)

Independent of the pressure of the gas

Answer 2

$\frac{x}{m} = kp^{1/n}$

$\ln\frac{x}{m} = \ln k + \frac{1}{n}\ln p\left\lbrack \because Slope = \frac{1}{n} = 0 \right\rbrack$

Thus, $\frac{x}{m} = kp^{0} \Rightarrow \frac{x}{m} = k$