Which of the following is a true/correct statement?   a. Bromide ion's activity coefficient is greater in a solution of ionic strength (I) equal to 0.30 M than in a solution with I = 0.04 M. b. At I = 0.001 M, Cr3+ ion has greater activity coefficient (γ) than Ce4+. c. In equilibrium expressions, γ is always equal to unity. d. Cl- will have higher γ than C₆H₁₂O₆ at I = 0.002 M since Cl- is charged.

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