GKFix MCQ Question

In the reaction N₂O₄(g) ⇌ 2NO₂(g), what is the correct expression for Kp?

• A. Kp = pN₂O₄ / (pNO₂)²
• B. Kp = (pNO₂)² / pN₂O₄
• C. Kp = pN₂O₄ × (pNO₂)²
• D. Kp = pNO₂ / pN₂O₄