GKFix MCQ Question

Which isomer of [Fe(NH₃)₂(CN)₄]⁻ is polar?

• A. trans-[Fe(NH₃)₂(CN)₄]⁻
• B. [Fe(CN)₆]³⁻
• C. [Fe(NH₃)₆]³⁺
• D. cis-[Fe(NH₃)₂(CN)₄]⁻