💯 Hydrogen Chapter Revision Q&A for JEE Advanced Q: What is the electron configuration of hydrogen ? A: 1s 1 . Q: What is the bond length of the H 2 molecule? A: Approximately 0.74 Å. Q: What type of bond is present in H 2 molecule? A: A sigma covalent bond formed by overlap of 1s orbitals. Q: What is the bond dissociation energy of H 2 ? A: Approximately 436 kJ/mol. Q: What is isotopes of hydrogen ? A: Protium , deuterium , and tritium . Q: What is the main use of deuterium? A: Heavy water (D 2 O) used as moderator in nuclear reactors . Q: How is hydrogen prepared in laboratory? A: Reaction of Zn with dilute H 2 SO 4 . Q: Industrial method of hydrogen production? A: Water gas reaction and steam methane reforming . Q: What is the reaction of hydrogen with oxygen? A: 2H 2 + O 2 → 2H 2 O (highly exothermic). Q: What is hydrogen’s oxidation state in H 2 O? A: +1. Q: Which is more stable, ortho-hydrogen or para-hydrogen? A: Para-hydrogen is mor...