Chemistry - Chemical Kinetics Question with Solution | TestHub

ChemistryChemical KineticsArrhenius EquationMedium2 minQB

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Passage / Comprehension

The rates of chemical reactions are strongly affected by temperature. Arrhenius (1889) gave the following relation between rate constant and temperature:

$k = A e^{- E_{a} / RT} .. \dots (i)$

This equation is called Arrhenius equation. The constant 'A' is called Arrhenius constant or pre-exponential factor. Logarithm of equation (i) is given as:

$l o g_{10} k = l o g_{10} A - \frac{E _{a}}{2.303 RT}$ ....(ii)

The rate constant for a reaction is:

$lo g_{10} k (sec^{- 1}) = 14 - \frac{1.25 \times 1 0 ^{4} K}{T}$ .....(iii)

The pre-exponential factor or frequency factor of the reaction under consideration is:

Options:

Answer:

Solution:

$lo g A = 14$

$∴ A = 1 0^{14} sec^{- 1}$

Stream:JEESubject:ChemistryTopic:Chemical KineticsSubtopic:Arrhenius Equation

⏱ 2mℹ️ Source: QB

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