Which one of the following is true for an exothermic reaction A leftharpoons B, if Ef and Eb are the activation energies of forward and backward reactions respectively?

Question

Which one of the following is true for an exothermic reaction A leftharpoons B, if Ef and Eb are the activation energies of forward and backward reactions respectively? (A) Ef > Eb (B) Ef=Eb (C) Ef=-Eb (D) Ef < Eb

Tardigrade Admin · Accepted Answer

Activation energy for the forward reaction,

E_{f}

and the activation energy for the backward reaction,

E_{b}

are related to the enthalpy of the reaction by the equation.

Δ_{r} H = E_{f} - E_{b}

For exothermic reaction

Δ_{r} H < 0

E_{b} > E_{f}

Q. Which one of the following is true for an exothermic reaction $A ⇌ B$ , if $E_{f}$ and $E_{b}$ are the activation energies of forward and backward reactions respectively?

$E_{f} > E_{b}$

$E_{f} = E_{b}$

$E_{f} = - E_{b}$

$E_{f} < E_{b}$

Activation energy for the forward reaction, $E_{f}$ and the activation energy for the backward reaction, $E_{b}$ are related to the enthalpy of the reaction by the equation.

$Δ_{r} H = E_{f} - E_{b}$

For exothermic reaction

$Δ_{r} H < 0$

$E_{b} > E_{f}$

Q. Which one of the following is true for an exothermic reaction A⇌B, if Ef​ and Eb​ are the activation energies of forward and backward reactions respectively?

Ef​>Eb​

Ef​=Eb​

Ef​=−Eb​

Ef​<Eb​