A graph between x/m and the pressure P of the gas at a constant temperature is called…
Chemistry · JEE Advanced · NTA Exams — Surface Chemistry
A graph between x/m and the pressure P of the gas at a constant temperature is called adsorption isotherm. Where x is the no. of moles of the adsorbate and m is the mass of the adsorbent. Adsorption isotherms of different shapes have been experimentally observed. According to Fruendlich adsorption isotherm.
x/m = kP1/n
where k and n are constant parameters depending upon the nature of the solid and gas.
In the given isotherm select the incorrect statement:
- \(\frac{\mathrm{x}}{\mathrm{~m}} \propto \mathrm{P}^{1 / \mathrm{n}}\) along OA
- \(\frac{\mathrm{x}}{\mathrm{~m}} \propto \mathrm{P}^{0}\) when point B is reached
- \(\frac{\mathrm{x}}{\mathrm{~m}}\) does not increase as rapidly with pressure along BC due to less surface area available for adsorption
- nature of isotherm is different for two gases for same adsorbent
Answer
(B) x ~m P ^ 0 when point B is reached
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