GKFix MCQ Question

What is the formula for Kp in the reaction N₂O₄(g) ⇌ 2NO₂(g)?

• A. Kp = p_NO₂ / p_N₂O₄
• B. Kp = (p_NO₂)² / p_N₂O₄
• C. Kp = p_N₂O₄ / (p_NO₂)²
• D. Kp = 2 p_NO₂ / p_N₂O₄