GATE 2019 CY – Question 16

Physical Chemistry · Surfaces and Interfaces: Physisorption and chemisorption. Langmuir, Freundlich and Brunauer-Emmett-Teller (BET) isotherms. Surface catalysis: Langmuir-Hinshelwood mechanism. Surface tension, viscosity, Self- assembly/ physical chemistry of colloids, micelles and macromolecules. · 1 mark · Multiple choice

For the Freundlich adsorption isotherm, which plot is linear? θ is surface coverage and p gas partial pressure.

θ against p
ln θ against ln p
ln θ against p
θ against ln p

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Correct answer: (B) ln θ against ln p

Explanation

The empirical Freundlich relation is θ=Kp^(1/n). Taking natural logarithms gives $\ln\theta=\ln K+(1/n)\ln p$, a straight line of slope 1/n and intercept lnK. Thus B.

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