GKFix MCQ Question

What is the Kb expression for hydrazine (NH2NH2)?

• A. [NH2NH2] / [NH2NH3+][OH–]
• B. [NH2NH3+][OH–] / [NH2NH2]
• C. [NH2NH3+][NH2NH2] / [OH–]
• D. [OH–] / [NH2NH3+]