Q99 · CSIR-NET Chemistry, June 2014

Paper: CSIR-NET June 2014 · Subject: Physical Chemistry · Chapter: Surface Chemistry · Topic: Adsorption Isotherms · Marks: 2 · Difficulty: Medium

For the non dissociative Langmuir type adsorption of a gas on a solid surface at a particular temperature, the fraction of surface coverage is 0.6 at 30 bar. The Langmuir isotherm constant (in bar $^{-1}$ units) at this temperature is
(a)0.05
(b)0.20
(c)2.0
(d)5.0
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
K = θ/[(1 − θ)p] = 0.6/(0.4 × 30) = 0.05 bar⁻¹.

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