Which of the following statements is correct?
- A$\Delta G$ is equal to $\Delta G^{\circ}$ when the system is at the standard state.
- B$\Delta G^{\circ}$ is zero when the system is at equilibrium.
- C$\Delta G$ measures activation energy of a reaction.
- DWhen $\Delta G$ is positive,the reaction should proceed forward to form more product.
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