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ChemistryJEE Main 21 Jan 2026, Shift 2·Q8·MCQ·Easy–moderate

Chemical Kinetics · First order gaseous decomposition

Decomposition of A is a first order reaction at T(K) and is given by A(g)→B(g)+C(g)\ce{A(g) -> B(g) + C(g)}. In a closed 1 L vessel, 1 bar A(g) is allowed to decompose at T(K). After 100 minutes, the total pressure was 1.5 bar. What is the rate constant (in min−1^{-1}) of the reaction ? (log⁡2=0.3\log 2 = 0.3)
  1. (1)6.9×10−16.9\times10^{-1}
  2. (2)6.9×10−36.9\times10^{-3}
  3. (3)6.9×10−26.9\times10^{-2}
  4. (4)6.9×10−46.9\times10^{-4}

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See the full 21 Jan 2026, Shift 2 paper