With a 10°C rise in temperature, the rate constant of a reaction
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → is nearly doubled.
For most chemical reactions, the rate constant is nearly doubled for a 10° rise in temperature. The reason lies in the Arrhenius equation:
\( \displaystyle k=A\,e^{-E_a/RT} \)
A small rise in temperature roughly doubles the fraction of molecules whose energy is at least the activation energy, so the number of effective collisions, and with it k, nearly doubles.
NCERT (2026-27 edition):
Temperature Dependence of the Rate of a Reaction
