alleryFor a first-order reaction, rate ∝:
A[A]⁰
B[A]¹
C[A]²
D[A]^0.5
Answer & Solution
Correct answer: B. [A]¹
**First order:** rate = k[A].
**Examples:** radioactive decay, decomposition of H₂O₂.
Half-life is constant (independent of initial concentration).
Keep practising Unit 5A1: Reaction Rates and Rate Laws
Browse all Unit 5A1: Reaction Rates and Rate Laws questions for JEE Advanced, or explore more Chemistry topics.
Related questions
For elementary bimolecular reaction 2 NO → products, rate law is:A catalyst lowers Ea from 100 kJ/mol to 75 kJ/mol at T = 300 K. Rate enhancement factor (RFor radioactive decay (1st order), if 1/8 of initial nuclei remain, how many half-lives elA reaction has k = 0.05 s⁻¹. After how many seconds is 90% complete?For reaction A → B with rate constant 10⁻³ s⁻¹ (first order), concentration after 1000 s iThreshold energy = Ea + average kinetic energy of reactants. If Ea = 50 kJ/mol and avg KE For Arrhenius plot of ln k vs 1/T, slope equals:For complex reaction with rate-determining step that involves 2 molecules of A, the order