Chemistry Reaction Kinetics SET 2019
PMDC Verified Question 54 of 80
For which change of temperature, the rate of reaction become approximately double:
A
10°C
B
293K
C
283K
D
20°C
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 10°C
Concept:

A general rule of thumb in chemical kinetics states that for many common homogeneous reactions, the reaction rate approximately doubles for a specific incremental rise in temperature.

Formula:

$$ \frac{k_{T + 10}}{k_T} \approx 2 $$

Solution:

  • This phenomenon occurs because a 10 K (or 10°C) rise in temperature significantly increases the fraction of molecules possessing energy greater than the activation energy.
  • Therefore, the rate of reaction doubles for every 10°C or 10 K increase.


Why other options are incorrect:

20°C would roughly quadruple the rate. 283K and 293K are absolute temperature values, not increments of change.

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