GKFix MCQ Question

What is the correct expression for Kp for the reaction: 4NH₃(g) + 5O₂(g) ⇌ 4NO(g) + 6H₂O(g)?

• A. Kp = (P_NO⁴ × P_H₂O⁶) / (P_NH₃⁴ × P_O₂⁵)
• B. Kp = (P_NH₃⁴ × P_O₂⁵) / (P_NO⁴ × P_H₂O⁶)
• C. Kp = (P_NO × P_H₂O) / (P_NH₃ × P_O₂)
• D. Kp = (P_NH₃ × P_O₂) / (P_NO × P_H₂O)