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  • For the equilibrium <img alt="\mathrm{A}(\mathrm{g}) \rightleftharpoons \mathrm{B}(\mathrm{g})+70 \mathrm{~kJ} / \mathrm{mol}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7BA%7D%

For the equilibrium \mathrm{A}(\mathrm{g}) \rightleftharpoons \mathrm{B}(\mathrm{g})+70 \mathrm{~kJ} / \mathrm{mol} and forward activation energy is 4/5 times of backward reaction, which of the following statements is true?

A) The forward reaction is endothermic and the reverse reaction is exothermic.

B) The forward reaction is exothermic and the reverse reaction is endothermic.

C) The forward reaction is slower than the reverse reaction.

D) The forward reaction is faster than the reverse reaction.

Option: 1

B ONLY


Option: 2

B AND D ONLY


Option: 3

A AND B ONLY


Option: 4

B AND C ONLY


Answers (1)

To determine the correct answer, let's analyze the given information step by step:

\Delta \mathrm{H} \text { (enthalpy change) is }-70 \mathrm{~kJ} / \mathrm{mol} \text { : }

If the enthalpy change (\Delta \mathrm{H}) is negative, it indicates an exothermic reaction. This means that the forward reaction (\mathrm{A}(\mathrm{g}) \rightarrow \mathrm{B}(\mathrm{g})) releases heat energy to the surroundings.Therefore, the reverse reaction (\mathrm{B}(\mathrm{g}) \rightarrow \mathrm{A}(\mathrm{g})) is endothermic because it would require an input of heat energy to proceed in the reverse direction.

The ratio of activation energies (\mathrm{E_f} / \mathrm{E_b}) \text { is } 4 / 5

The activation energy (\mathrm{Ea}) is the energy required for a reaction to occur.
Given that the ratio of activation energies (\mathrm{E_f} / \mathrm{E_b})\: \text{is} \: 4 / 5, it implies that the activation energy for the forward reaction (\mathrm{E_f}) is lower than the activation energy for the reverse reaction (Eb). Since a lower activation energy means less energy is required for the reaction to occur, it indicates that the forward reaction is faster than the reverse reaction.
Based on the above analysis, we can conclude that the correct statements are:

B) The forward reaction is exothermic, and the reverse reaction is endothermic.

D) The forward reaction is faster than the reverse reaction.

Therefore, the correct option is 2. B AND D ONLY.

Posted by

Ramraj Saini

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