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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 4 August 2021, Shift 1, Chemistry Q33

Question 33 of 90 in this shift, Chemistry question 3 of 30, Section A.

For a gaseous reaction, A(g)→2B(g)+C(g)\mathrm{A_{(g)} \rightarrow 2B_{(g)} + C_{(g)}}, the rate of decomposition of A(g)\mathrm{A_{(g)}} may be studied by measuring the pressure (P) in a system at constant volume (V) and temperature (T). If all the gaseous species follow ideal gas equation, then which of the relation is correct?
  1. (1)Rate of reaction =2RTdPdT= 2RT\frac{dP}{dT}
  2. (2)Rate of reaction =RTdPdT= RT\frac{dP}{dT}
  3. (3)Rate of reaction =12RTdPdT= \frac{1}{2RT}\frac{dP}{dT}Official answer
  4. (4)Rate of reaction =1RTdPdT= \frac{1}{RT}\frac{dP}{dT}

Official answer

Option 3

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.