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Saturday, 31 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 5 April 2024, Shift 2, Chemistry Q85

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

Consider the following single step reaction in gas phase at constant temperature. 2A(g)+B(g)→C(g)\mathrm{2A_{(g)} + B_{(g)} \rightarrow C_{(g)}} The initial rate of the reaction is recorded as r1\mathrm{r_1} when the reaction starts with 1.5 atm pressure of A and 0.7 atm pressure of B. After some time, the rate r2\mathrm{r_2} is recorded when the pressure of C becomes 0.5 atm. The ratio r1:r2\mathrm{r_1 : r_2} is ________ ×10−1\times10^{-1}. (Nearest integer)

Official answer

315

NTA final key.

Chapter
Chemical Kinetics
Topic
Rate Laws
Idea tested
Rate and Stoichiometry

Same idea in other shifts

Asked 7× in all
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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 108 of the 174 JEE Main shifts held from 2017 to 2026.