A. Helium
B. Hydrogen
C. Nitrogen
D. Sulfur
🧠 Explanation:
Hydrogen is a combustible gas, used in energy and reactions. For chemistry students, this highlights chemical properties, making it a key topic for studying chemistry, energy science, and engineering. Hydrogen fuels reactions. Understanding this ensures knowledge of gas properties. It’s essential for analyzing chemistry, material science, and engineering. Studying hydrogen offers insights into how gases power systems, crucial for chemistry, engineering, and energy science.
