Q74 · CSIR-NET Chemistry, June 2017

Paper: CSIR-NET June 2017 · Subject: Physical Chemistry · Chapter: Surface Chemistry · Topic: Adsorption Isotherms · Marks: 2 · Difficulty: Medium

The figure below depicts an adsorption isotherm of $\mathrm{O}_{2}$, on charcoal at 90 K .At a pressure 25 torr, only $10 \%$ of charcoal sites are occupied by $\mathrm{O}_{2}$. Therefore, the ratio of adsorption to desorption rate constants (in torr ${ }^{-1}$ ) is close to

(a)0.003

(b)0.004

(c)0.006

(d)0.015

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

Langmuir: θ = KP/(1 + KP). θ = 0.10 at 25 torr gives KP = 0.111, K = 0.0044 torr⁻¹ ≈ 0.004 (b).

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