JEE Main 2026 — Jan 22, Shift 2 — Chemistry solution

JEE Main2026Jan 22, Shift 2Chemistry

Correct statements regarding Arrhenius equation among the following are :

(A) Factor $e^{- E_{a} / R T}$ corresponds to fraction of molecules having kinetic energy less than $E_{a}$ .

(B) At a given temperature, lower the $E_{a}$ , faster is the reaction.

(D) Plot of $lo g k$ vs $\frac{1}{T}$ gives a straight line with slope $= - \frac{E _{a}}{R}$ .

Choose the correct answer from the options given below :

Solution

(A) Wrong - $e^{- E_{a} / R T}$ is the fraction of molecules having energy at least $E_{a}$ , not less.

(B) Correct - at fixed $T$ , smaller $E_{a}$ means larger rate constant ( $k = A e^{- E_{a} / R T}$ ).

(D) Wrong - taking $lo g$ of $k = A e^{- E_{a} / R T}$ gives a linear plot of $lo g k$ vs $1/ T$ with slope $- E_{a} / (2.303 R)$ .

Hence B and C are the correct statements.

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