GKFix MCQ Question

What is the correct expression for Kp for the reaction H₂(g) + I₂(g) ⇌ 2HI(g)?

• A. Kp = pH₂ × pI₂ / pHI
• B. Kp = pHI / (pH₂ × pI₂)
• C. Kp = (pHI)² / (pH₂ × pI₂)
• D. Kp = (pH₂ × pI₂) / (pHI)²