Chemical Kinetics: JEE Main 2026 Chemistry question

JEE Main 2026 · 23 Jan, Evening shift · Q57

JEE Main 202623 Jan, Evening shiftChemistryMediumChemical Kinetics62× since 2002

Observe the following reactions at T(K). I. A

\to

products. II.

\mathrm{5Br^-(aq)+BrO_3^-(aq)+6H^+(aq)\to3Br_2(aq)+3H_2O(l)}

. Both the reactions are started at 10.00 am. The rates of these reactions at 10.10 am are same. The value of

-\frac{\Delta[\mathrm{Br^-}]}{\Delta t}

at 10.10 am is

2\times10^{-4}

mol L

^{-1}

min

^{-1}

. The concentration of A at 10.10 am is

10^{-2}

mol L

^{-1}

. What is the first order rate constant (in min

^{-1}

) of reaction I?

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JEE Main 2026 Chemical Kinetics Question with Solution (23 Jan Evening shift, Q57) | JEE Arc

JEE Main 2026 · 23 Jan, Evening shift · Q57

JEE Main 202623 Jan, Evening shiftChemistryMediumChemical Kinetics62× since 2002

Observe the following reactions at T(K). I. A

\to

products. II.

\mathrm{5Br^-(aq)+BrO_3^-(aq)+6H^+(aq)\to3Br_2(aq)+3H_2O(l)}

. Both the reactions are started at 10.00 am. The rates of these reactions at 10.10 am are same. The value of

-\frac{\Delta[\mathrm{Br^-}]}{\Delta t}

at 10.10 am is

2\times10^{-4}

mol L

^{-1}

min

^{-1}

. The concentration of A at 10.10 am is

10^{-2}

mol L

^{-1}

. What is the first order rate constant (in min

^{-1}

) of reaction I?