Paper: CSIR-NET June 2017 · Subject: Physical Chemistry · Chapter: Chemical Kinetics · Topic: Arrhenius Activation · Marks: 2 · Difficulty: Medium
If the pre-exponential factor in Arrhenius equation is $1.6 \times 10^{12} \mathrm{s}^{-1}$, the value of the rate constant at extremely high temperature will be close to
(a)$1.6 \times 10^{12} \mathrm{s}^{-1}$
(b)$4.2 \times 10^{12} \mathrm{s}^{-1}$
(c)$2.4 \times 10^{9} \mathrm{s}^{-1}$
(d)$1.2 \times 10^{6} \mathrm{s}^{-1}$
Answer
Answer: A ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
As T → ∞, e^{−Ea/RT} → 1 and k → A = 1.6×10¹² s⁻¹.