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

$\frac{x}{m} = kp^{1/n}$
$ln \frac{x}{m} = lnk + \frac{1}{n}ln\,p$
$[\because$ Slope $= \frac{1}{n} = 0]$
Thus, $\frac{x}{m} = kp^{0} \Rightarrow \frac{x}{m} = k$