JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 25 July 2022, Shift 1, Chemistry Q85

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

The half life for the decomposition of gaseous compound A is

240

s when the gaseous pressure was

500

Torr initially. When the pressure was

250

Torr, the half life was found to be

4.0

min. The order of the reaction is ______. (Nearest integer)

Official answer

NTA final key (2022 Session 2).

Chapter: Chemical Kinetics
Topic: Integrated Rate Equations
Idea tested: Nth-Order Half-Life Proportionality

Same idea in other shifts

Asked 3× in all

26 Jul 2022, Shift 1 · Q88For a reaction $\mathrm{A} \rightarrow 2\mathrm{B} + \mathrm{C}$ the half lives are 100 s and 50 s when the concentration of reactant A is…MediumNumerical value
30 Jul 2022, Shift 2 · Q56 $\mathrm{X} \rightarrow \mathrm{Y} + \mathrm{Z}$ X decomposes at 700 K to give Y and Z. The results of two measurements are : Initial…MediumNumerical 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 108 of the 174 JEE Main shifts held from 2017 to 2026.