JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyApplication

JEE Main 25 June 2022, Shift 2, Chemistry Q84

Question 84 of 90 in this shift, Chemistry question 24 of 30, Section B.

At 345 K, the half life for the decomposition of a sample of a gaseous compound initially at 55.5 kPa was 340 s. When the pressure was 27.8 kPa, the half life was found to be 170 s. The order of the reaction is __________. [integer answer]

Official answer

NTA final key.

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

Same topic in other shifts

All Rate Laws questions

2 Apr 2026, Shift 2 · Q57Consider the reaction $aX \to bY$ , for which the rate constant at 30°C is $1 \times 10^{-3}$ mol $^{-1}$ L $s^{-1}$ . Which of the following…MediumSingle correct
7 Apr 2025, Shift 1 · Q57A person's wound was exposed to some bacteria and then bacterial growth started to happen at the same place. The wound was later treated…MediumDiagram basedHas a figure
7 Apr 2025, Shift 2 · Q57 $\mathrm{A(g)\to B(g)+C(g)}$ is a first order reaction. Time | $t$ | $\infty$ $p_{system}$ | $p_t$ | $p_\infty$ The reaction was started…MediumSingle correct
4 Apr 2024, Shift 2 · Q85Consider the following reaction, the rate expression of which is given below $\mathrm{A + B \rightarrow C}$ rate = k $[\mathrm{A}]^{1/2}$ …MediumNumerical value
5 Apr 2024, Shift 1 · Q85During Kinetic study of reaction $2\mathrm{A} + \mathrm{B} \rightarrow \mathrm{C} + \mathrm{D}$ , the following results were obtained : A…MediumNumerical valueHas a figure
5 Apr 2024, Shift 2 · Q85Consider the following single step reaction in gas phase at constant temperature. $\mathrm{2A_{(g)} + B_{(g)} \rightarrow C_{(g)}}$ The…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.