Which of the following statements is correct?

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(A) The correct statement is $A$. $\Delta G = \Delta G^{\circ}$ when the system is at the standard state (where all reactants and products are at $1 \

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$\Delta G$ is equal to $\Delta G^{\circ}$ when the system is at the standard state.

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(A) The correct statement is $A$. $\Delta G = \Delta G^{\circ}$ when the system is at the standard state (where all reactants and products are at $1 \ M$ concentration or $1 \ bar$ pressure).Analysis of other options:$B$. At equilibrium, $\Delta G = 0$, not $\Delta G^{\circ} = 0$.$C$. $\Delta G$ measures the spontaneity of a reaction, not the activation energy.$D$. When $\Delta G > 0$, the reaction is non-spontaneous in the forward direction and will proceed in the backward direction.

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