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In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption (x/m) is directly proportional to P^x. The value of x is

1. zero
2. 1/n
3. 1
4. ∞

Correct answer: 1/n

Solution

In the Freundlich adsorption isotherm, the parameter x represents the degree of non-linearity in the adsorption process, and it is defined as the reciprocal of the Freundlich constant 'n'. Therefore, at moderate pressures, the extent of adsorption is proportional to P raised to the power of 1/n, indicating that the adsorption capacity increases with pressure but at a diminishing rate.

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