JEE Main · 2021 · 01 Sep 2021 · Shift 2 · Chemical Kinetics

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Which one of the following given graphs represents the variation of rate constant (k) with temperature (T) for an endothermic reaction?

(A)(see structure)
✓ Correct
(B)(see structure)
(C)(see structure)
(D)(see structure)

Answer: (A)

Solution

By the Arrhenius equation

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

, raising the temperature drives the exponential term towards unity, so the rate constant increases with temperature for every reaction, endothermic or exothermic alike. The plot of

k

against

T

is a curve that rises ever more steeply, an exponential increase.

JEE Main · 2021 · 01 Sep 2021 · Shift 2 · Single correct option

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