Question

Freundlich adsorption isotherm is given by the expression `x/m = kp^(1/n)` which of the following conclusions can be drawn from this expression.

(i) When `1/n` = 0, the adsorption is independent of pressure.

(ii) When `1/n` = 0, the adsorption is directly proportional to pressure.

(iii) When n = 0, `x/m` vs p graph is a line parallel to x-axis.

(iv) When n = 0, plot of `x/m` vs p is a curve.

Answer 1

(i) When `1/n` = 0, the adsorption is independent of pressure.

(iii) When n = 0, `x/m` vs p graph is a line parallel to x-axis.

Explanation:

Freundlich gave an empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbed and pressure at a particular temperature.

`x/m = kp^(1/n)`

If `1/n` = 0; `x/m = k` extent of adsorption is independent of pressure

When n = 0; `x/m = kp`

`x/m` vs p is a line parallel to x-axis