Consider the first order | Chemical Kinetic | JEE MAIN 2026

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JEE MAIN_2026

04-04-26_S1

Question

Consider the first order reaction $\mathrm{R} \rightarrow \mathrm{P}$. The fraction of molecules decomposed in the given first order reaction can be expressed as

Select the correct option:

A

(1) $1-e^{k_1 t}$ (2) $1+e^{k_1 t}$ (3) $1+e^{-k_1 t}$ (4) $1-e^{-k_1 t}$

B

$1-e^{k_1 t}$

C

$1+e^{-k_1 t}$

D

$1-e^{-k_1 t}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

For I order reactions. $\begin{aligned} & a-x=a e^{-K_1 t} \\ & \frac{x}{a}=1-e^{-K_1 t}\end{aligned}$

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