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  4. <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/c-9ka1wiejfanxzju8.jpg /> Let the initial concentration of P is 1 M, the concentration of P after 33.33 sec is equal to?

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Q. Question
Let the initial concentration of $P$ is $1 \,M$, the concentration of $P$ after $33.33 \,\sec$ is equal to?

NTA AbhyasNTA Abhyas 2022

Solution:

$k_{eff}=k_{1}+k_{2}=3\times 10^{- 2}s^{- 1}$
$\left(P\right)_{t}=1\times e^{- k t}$
$=e^{- 3 \times 1 0^{- 2} \times 33.3}$
$=e^{- 0.99}=\frac{1}{e}$