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QJEEM20Ch55a3: JEE Main 2020 Chemistry - Class 12 JEEM20Ch55a3 Solution: Consider the following plots of rate constant versus 1 T for…

Consider the following plots of rate constant versus 1T for four different reactions. Which of the following orders is correct for the activation energies of these reactions?

JEE Main 2020 (Online) 8th January Evening Slot Chemistry - Chemical Kinetics and Nuclear Chemistry Question 118 English

Multiple Choice Options

  • A Ec > Ea > Ed > Eb
  • B Ea > Ec > Ed > Eb
  • C Eb > Ea > Ed > Ec
  • D Eb > Ed > Ec > Ea

Step-by-Step Verified Solution

We know

k=Ae−EaRT

⇒ logek=logeA−Ea2.303RT

According to Arhenius equation plot of logek versus 1T is linear.

Slope = −Ea2.303R

From plot we conclude :

Slope : c > a > d > b

So correct order of activation energies

Ec > Ea > Ed > Eb

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