Chemical Kinetics · JEE Advanced previous year questions

2025 1 question

1. Q442025 · 18 May 2025 · Paper 2· Numerical answer

   Consider a reaction $A+R⟶Product$. The rate of this reaction is measured to be $k[A][R]$. At the start of the reaction, the concentration of $R$, $[R{]}_0$, is $10$-times the concentration of $A$, $[A{]}_0$. The reaction can be considered to be a pseudo first order reaction with assumption that $k[R]=k^{\prime }$ is constant. Due to this assumption, the relative error (in $\%$) in the rate when this reaction is $40\%$ complete, is _________. [$k$ and $k^{\prime }$ represent corresponding rate constants]

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   Answer: 4 to 4.25