Q78 · CSIR-NET Chemistry, December 2016
Paper: CSIR-NET December 2016 · Subject: Physical Chemistry · Chapter: Chemical Kinetics · Topic: Chemical Kinetics – General · Marks: 2 · Difficulty: Easy
According to the transition state theory, the plot with slope equal to $\frac{\Delta \mathrm{H}^{+}}{\mathrm{R}}$ is
(a)ln k vs. T
(b)$\ln \frac{\mathrm{k}}{\mathrm{T}}$ vs T
(c)$\ln \frac{\mathrm{k}}{\mathrm{T}}$ vs $\frac{1}{\mathrm{T}}$
(d)$\ln \mathrm{k}$ vs. $\frac{1}{\mathrm{T}}$
Answer
Answer: C ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
From the Eyring equation, ln(k/T) = ln(k_B/h) + ΔS‡/R − ΔH‡/RT. The plot of ln(k/T) vs 1/T has slope of magnitude ΔH‡/R (negative sign) (c).
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