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NEET 2026
Exam
NEET
Year
2026
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2026 · Chemistry · Chemical Kinetics

For an elementary chemical reaction, the Arrhenius plot is given...

For an elementary chemical reaction, the Arrhenius plot is given below.
For an elementary chemical reaction, the Arrhenius plot is given below. If the energy of activation is 6.64 kJ mol ^ -1
If the energy of activation is 6.646.64 kJ mol−1^{-1} and R =8.3=8.3 J K−1^{-1} mol−1^{-1}, the temperature at which the rate constant becomes e2e^2 min−1^{-1}, is

Options

  1. A250250 K
  2. B125125 K
  3. C150150 K
  4. D200200 K

Correct answer

D. 200200 K

Step-by-step solution

According to the Arrhenius equation:

ln⁡k=ln⁡A−EaRT\ln k = \ln A - \dfrac{E_a}{RT}

For a plot of ln⁡k\ln k versus 1/T1/T, the y-intercept corresponds to ln⁡A\ln A. From the given graph, the line intersects the y-axis at 66.

Therefore, ln⁡A=6\ln A = 6.

We are given:
Ea=6.64 kJ mol−1=6640 J mol−1E_a = 6.64 \text{ kJ mol}^{-1} = 6640 \text{ J mol}^{-1}
R=8.3 J K−1 mol−1R = 8.3 \text{ J K}^{-1} \text{ mol}^{-1}
k=e2 min−1k = e^2 \text{ min}^{-1}, which gives ln⁡k=ln⁡(e2)=2\ln k = \ln(e^2) = 2

Substituting these values into the Arrhenius equation:

2=6−66408.3×T2 = 6 - \dfrac{6640}{8.3 \times T}

66408.3×T=6−2\dfrac{6640}{8.3 \times T} = 6 - 2

66408.3×T=4\dfrac{6640}{8.3 \times T} = 4

T=66404×8.3T = \dfrac{6640}{4 \times 8.3}

T=664033.2T = \dfrac{6640}{33.2}

T=200 KT = 200 \text{ K}

Answer: 200200 K
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