✓ Board-verified
Chemistry · 2025 · 3 marks
CBSE 2025 · Region 1 · Set 3 · Q24
The rate of a reaction quadruples when the temperature changes from 293 K to 313 K. Calculate the energy of activation of the reaction assuming that…
The rate of a reaction quadruples when the temperature changes from $\displaystyle 293$ K to $\displaystyle 313$ K . Calculate the energy of activation of the reaction assuming that it does not change with temperature. $\displaystyle 3$ [Given : $\displaystyle \log 4=0.602, \log 2=0.301, \mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$ ]
Marking-scheme solution
log K = - Ea /$\displaystyle 2.303$ RT
log
𝐸𝑎
$\displaystyle 2.303$ ×$\displaystyle 8.314$
[$\displaystyle 313$−$\displaystyle 293$]
[$\displaystyle 313$ ×$\displaystyle 293$]
log $\displaystyle 4$ =
𝐸𝑎
[$\displaystyle 20$]
[$\displaystyle 313$ ×$\displaystyle 293$]
Ea=
$\displaystyle 0.602$ ×$\displaystyle 19.147$ ×$\displaystyle 313$ ×$\displaystyle 293$
=$\displaystyle 52850$ J mol-$\displaystyle 1$ / $\displaystyle 52.85$ kJ mol-$\displaystyle 1$
All Chemical Kinetics questions2025 question paperNCERT solutions: Chemical KineticsPractice Chemical Kinetics →
More from Chemical Kinetics
- Assertion: Order of reaction is applicable to elementary as well as complex reactions. Reason (R): For a complex reaction molecularity has no meaning.2023 · asked 2×
- For the reaction 3 A → 2 B, rate of reaction +(d[B])/dt is equal to2023 · asked 2×
- Assertion: For a zero order reaction the unit of rate constant and rate of reaction are same. Reason (R): Rate of reaction for zero order reaction is…2023 · asked 2×
- Assertion: Hydrolysis of an ester follows first order kinetics. Reason (R): The concentration of water does not get altered much during the reaction.2025
- Show that the time required for 99.9 % completion in a first order reaction is 10 times of half-life (t_1 / 2) of the reaction [ log 2=0.3010, log…2024
- In the given reaction N_2( g)+3 H_2( g) → 2 NH_3( g) the rate of formation of NH_3 is 3 · 6 × 10^-4 mol L^-1 s^-1. Calculate the (i) rate of…2022
- Reactant 'A' underwent a decomposition reaction. The concentration of 'A' was measured periodically and recorded in the table given below: Based on…2025
- Which of the following curve represents the first order reaction?2026
CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.