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  4. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/a23ff1b08d9ae25596d26a5da0f5b112-.png /> Ef= activation energy of forward reaction Eb= activation energy of backward reaction Et= threshold energy The activation energies for forward and backward reactions of a chemical reaction are 30.5 and 45.4 kJ mol -1 respectively. The reaction is

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$E_{f}=$ activation energy of forward reaction
$E_{b}=$ activation energy of backward reaction
$E_{t}=$ threshold energy
The activation energies for forward and backward reactions of a chemical reaction are $30.5$ and $45.4\, kJ\,mol ^{-1}$ respectively. The reaction is

Chemical Kinetics

Solution:

Correct answer is (a) exothermic