JEE Main 2026 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 2 April 2026, Shift 1, Chemistry Q58

Question 58 of 75 in this shift, Chemistry question 8 of 25, Section A.

t_{100\%}

is the time required for the

100\%

completion of the reaction while

t_{1/2}

is the time required for

50\%

of the reaction to be completed. Which of the following option correctly represents the relation between

t_{100\%}

and

t_{1/2}

for zero and first order reactions respectively ?

(1) $t_{100\%}=(t_{1/2})^2$ and $t_{100\%}=(t_{1/2})^{-\infty}$
(2) $t_{100\%}=2t_{1/2}$ and $t_{100\%}=(t_{1/2})^{\infty}$ Official answer
(3) $t_{100\%}=2t_{1/2}$ and $t_{100\%}=(2t_{1/2})^2$
(4) $t_{100\%}=(t_{1/2})^{\infty}$ and $t_{100\%}=2t_{1/2}$

Official answer

Option 2

NTA final key.

Chapter: Chemical Kinetics
Topic: Integrated Rate Equations
Idea tested: Zero Order Reaction Completion Time

Same topic in other shifts

All Integrated Rate Equations questions

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.