JEE Main 2024 — Chemical Kinetics Question with Solution
JEE Main 2024 (05 Apr Shift 2)
Question
Consider the following single step reaction in gas phase at constant temperature.
The initial rate of the reaction is recorded as when the reaction starts with pressure of and pressure of . After some time, the rate is recorded when the pressure of becomes . The ratio is ______ . (Nearest integer)
Enter your answer
Show full solutionCorrect answer: 315
Correct answer
315
Step-by-step explanation
$\begin{array}{ll} \mathrm{r}_1 & 1.5 \mathrm{~atm} \quad 0.7 \mathrm{~atm} \\ \mathrm{r}_2 & 0.5 \mathrm{~atm} \quad 0.2 \mathrm{~atm} \quad 0.5 \mathrm{~atm} \\ & \because \mathrm{r}=\mathrm{K}\left[\mathrm{P}_{\mathrm{A}}\right]^2\left[\mathrm{P}_{\mathrm{B}}\right] \\ & \mathrm{r}_1=\mathrm{K}[1.5]^2[0.7] \\ & \mathrm{r}_2=\mathrm{K}[0.5]^2[0.2] \\ & \frac{\mathrm{r}_1}{\mathrm{r}_2}=9 \times \frac{7}{2}=31.5=315 \times 10^{-1} \end{array}$ Ans. 315
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This is a previous-year question from JEE Main 2024, covering the Chemical Kinetics chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.