P Praveen Singh 🎓 Tutor III ⭐ 36.81K Points 📊 Physics Q. Hydrogen is an important constituent of (A) Water (B) Petroleum (C) Natural gas (D) all of these 👁️ Show Answer 🔗 Share ⚡Menu ✅ Correct Answer: (D) all of these You must be Logged in to update hint/solution 💬 Discussion 💬 Comment