MCQMediumJEE Main 2026 · 21 January, Shift 2Integrated Rate Laws

Chemistry Question from JEE Main 2026 · 21 January, Shift 2

Decomposition of AA is a first order reaction at T(K)T(\text{K}) and is given by A(g)→B(g)+C(g)A(\text{g}) \rightarrow B(\text{g}) + C(\text{g}).

In a closed 1 L1 \, \text{L} vessel, 1 bar1 \, \text{bar} A(g)A(\text{g}) is allowed to decompose at T(K)T(\text{K}). After 100 minutes100 \, \text{minutes}, the total pressure was 1.5 bar1.5 \, \text{bar}. What is the rate constant (in min−1\text{min}^{-1}) of the reaction ? (log⁡2=0.3\log 2 = 0.3)

  • A

    6.9×10−46.9 \times 10^{-4}

  • B

    6.9×10−16.9 \times 10^{-1}

  • C

    6.9×10−26.9 \times 10^{-2}

  • D

    6.9×10−36.9 \times 10^{-3}

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