Chemistry · EQUILIBRIUM

Consider the following statements regarding the general characteristics of equilibria involving physical processes: (A) Equilibrium is possible only in a closed system at a given temperature. (B) Both opposing processes occur at different rates to maintain dynamic stability. (C) All measurable macroscopic properties of the system remain constant. (D) When equilibrium is attained, it is characterized by a constant value of one of its parameters at a given temperature. Which of the above statements are correct?

1. A
   (A), (B) and (C) only
2. B
   (A), (C) and (D) only
3. C
   (B) and (D) only
4. D
   (A), (B), (C) and (D)