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MCQMediumJEE Main 2025 · 29 January, Shift 1Order & Molecularity

Chemistry Question from JEE Main 2025 · 29 January, Shift 1

The reaction A2+B2→2AB\text{A}_2 + \text{B}_2 \to 2\text{AB} follows the mechanism:

A2→k1A+A (fast)A+B2→k2AB+B (slow)A+B→AB (fast)\text{A}_2 \xrightarrow{k_1} \text{A} + \text{A} \ (\text{fast}) \quad \text{A} + \text{B}_2 \xrightarrow{k_2} \text{AB} + \text{B} \ (\text{slow}) \quad \text{A} + \text{B} \to \text{AB} \ (\text{fast})

The overall order of the reaction is:

  • A

    33

  • B

    1.51.5

  • C

    2.52.5

  • D

    22

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