JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 3 September 2020, Shift 2, Chemistry Q29

Question 29 of 75 in this shift, Chemistry question 4 of 25.

For the reaction

2\mathrm{A} + 3\mathrm{B} + \frac{3}{2}\mathrm{C} \rightarrow 3\mathrm{P}

, which statement is correct ?

(1) $\frac{dn_A}{dt} = \frac{3}{2}\frac{dn_B}{dt} = \frac{3}{4}\frac{dn_C}{dt}$
(2) $\frac{dn_A}{dt} = \frac{2}{3}\frac{dn_B}{dt} = \frac{3}{4}\frac{dn_C}{dt}$
(3) $\frac{dn_A}{dt} = \frac{2}{3}\frac{dn_B}{dt} = \frac{4}{3}\frac{dn_C}{dt}$ Official answer
(4) $\frac{dn_A}{dt} = \frac{dn_B}{dt} = \frac{dn_C}{dt}$

Official answer

Option 3

NTA final key (Sep 2020).

Chapter: Chemical Kinetics
Topic: Rate Laws
Idea tested: Rate and Stoichiometry

Same idea in other shifts

Asked 7× in all

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.