✓ Board-verified
Chemistry · 2023 · 1 mark
CBSE 2023 · Region 1 · Set 1 · Q17
Assertion (A): The molecularity of the reaction H_2+ Br_2 → 2 HBr appears to be 2. Reason (R): Two molecules of the reactants are involved in the…
Assertion $\displaystyle (A)$: The molecularity of the reaction $\displaystyle \mathrm{H}_{2}+\mathrm{Br}_{2} \longrightarrow 2 \mathrm{HBr}$ appears to be 2.
Reason (R) : Two molecules of the reactants are involved in the given elementary reaction.
Official answer
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
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.