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BITSAT2019ChemistrySurface ChemistryActual

In Freundlich adsorption isotherm, the value of 1 / n is

Options

  1. Abetween 0 and 1 in all cases
  2. Bbetween 2 and 4 in all cases
  3. Calways 1 in case of physical adsorption
  4. Dalways 1 in use of chemical adsorption

Correct answer

A. between 0 and 1 in all cases

Step-by-step solution

Freundlich isotherm is related with the pressure of gas adsorbed, as follows x m = k · p 1 / n where, x m = amount of gas x adsorbed over the surface of mass m . p = pressure of gas k = freundlich constant Thus, value of ' n ' is always greater than 1 and therefore value of 1 / n lies between 0 and 1 .

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