Q27 / 125 · BITSAT 2019 · Chemistry

For a reversible reaction, $A ⇌ B$ , which one of the following statement is wrong from the given energy profile diagram?

A
Activation energy of forward reaction is greater than backward reaction
B
The forward reaction is endothermic
Correct answer
C
The threshold energy is less than that of activation energy
D
The energy of activation of forward reaction is equal to the sum of heat of reaction and the energy of activation of backward reaction

Solution

where, $E_{a} =$ activation energy of forward reaction

$E_{a}^{'} =$ activation energy of backward reaction

The above energy profile diagram shows that $E_{a} > {E_{a}}^{'}$

The potential energy of the product is greater than that of the reactant, so the reaction is endothermic.

$E_{a} = E_{a}^{'} + ΔE$

$E_{t} = E_{a}$ or $E_{t} > {E_{a}}^{'}$

Hence, the correct answer is option: 'C'.