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Question: Answered & Verified by Expert
If a reaction follows the Arrhenius equation, the plot $\ln k$

vs $\frac{1}{(\mathrm{RT})}$ gives straight line with a gradient $(-\mathrm{y})$ unit.

The energy required to activate the reactant is:
ChemistryChemical KineticsJEE MainJEE Main 2019 (11 Jan Shift 1)
Options:
  • A $y / R$ unit
  • B y unit
  • C yR unit
  • D $-y$ unit
Solution:
1842 Upvotes Verified Answer
The correct answer is: y unit
From Arrhenius equation,

$k=A e^{-E_{n} / R T}$

$\ln k=\ln A-\frac{E_{a}}{R T}$

slope $=-y$ (given) $-y=-E_{s}$

$\Rightarrow \mathrm{E}_{\mathrm{a}}=y$

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