✓ Board-verified
Chemistry · 2023 · 1 mark
CBSE 2023 · Region 1 · Set 2 · Q4
A first order reaction takes 30 minutes for 50 % completion. The value of rate constant k would be:
A first order reaction takes $\displaystyle 30$ minutes for $\displaystyle 50 \%$ completion. The value of rate constant k would be:
Official answer
(D)
$\displaystyle 2.31 \times 10^{-3} \mathrm{~min}^{-1}$
All Chemical Kinetics questions2023 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 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.