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Friday, 16 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 6 April 2024, Shift 2, Chemistry Q85

Question 85 of 90 in this shift, Chemistry question 25 of 30, Section B.

Consider the two different first order reactions given below A+B→CA + B \rightarrow C (Reaction 1) P→QP \rightarrow Q (Reaction 2) The ratio of the half life of Reaction 1 : Reaction 2 is 5 : 2. If t1t_1 and t2t_2 represent the time taken to complete 2/3rd2/3^{\mathrm{rd}} and 4/5th4/5^{\mathrm{th}} of Reaction 1 and Reaction 2, respectively, then the value of the ratio t1:t2t_1 : t_2 is ________ ×10−1\times 10^{-1} (nearest integer). [Given : log⁡10(3)=0.477\log_{10}(3) = 0.477 and log⁡10(5)=0.699\log_{10}(5) = 0.699]

Official answer

17

NTA final key.

Chapter
Chemical Kinetics
Topic
Rate Laws
Idea tested
First-Order Kinetics

Same idea in other shifts

Asked 2× in all
  1. 28 Jul 2022, Shift 1 · Q86For the given first order reaction A→B\mathrm{A\to B} the half life of the reaction is 0.3010 min. The ratio of the initial concentration…EasyNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.