Question

Plots showing the variation of the rate constant (k) with temperature (T) are given below. The plot that follows Arrhenius equation is:

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Explanation:

• The Arrhenius plot is used to study the effect of temperature on reaction rates.
• The Arrhenius plot can also be used by extrapolating the line back to the y-intercept to obtain the pre-exponential factor, A.
• The pre-exponential, or frequency, the factor is related to the number of times molecules will hit in the orientation necessary to cause a reaction.
• According to Arrhenius equation, rate constant increases exponentially with temperature:

$k=A{e}^{-E_a/RT}$

Hence, option (C) is correct.