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ChemistryJEE Main 5 Apr 2026, Shift 1·Q7·MCQ·Easy–moderate

Chemical Kinetics · First order gas phase kinetics

First order gas phase reaction

A→B+C\ce{A -> B + C}

pip_\mathrm{i} = initial pressure of gas A, ptp_\mathrm{t} = total pressure of the reaction mixture at time tt

Expression of rate constant (kk) is

  1. (1)1tln⁡pi2pi−pt\dfrac{1}{t}\ln\dfrac{p_\mathrm{i}}{2p_\mathrm{i}-p_\mathrm{t}}
  2. (2)1tln⁡2pipi−pt\dfrac{1}{t}\ln\dfrac{2p_\mathrm{i}}{p_\mathrm{i}-p_\mathrm{t}}
  3. (3)1tln⁡pi3pi−2pt\dfrac{1}{t}\ln\dfrac{p_\mathrm{i}}{3p_\mathrm{i}-2p_\mathrm{t}}
  4. (4)1tln⁡3pi4pi−pt\dfrac{1}{t}\ln\dfrac{3p_\mathrm{i}}{4p_\mathrm{i}-p_\mathrm{t}}

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See the full 5 Apr 2026, Shift 1 paper