Answer: Ionic (saline) hydrides.
- A Ionic (saline) hydrides
- B Covalent hydrides
- C Interstitial hydrides
- D Polymeric hydrides
Correct answer: A. Ionic (saline) hydrides
Explanation: Alkali metals (Group 1) react with H<sub>2</sub> to form ionic hydrides containing H- ions (e.g., NaH, LiH).
Each water molecule's O-H bonds (covalent, solid) can hydrogen-bond (dashed) to neighbouring molecules, forming an extended network responsible for water's unusually high boiling point and density anomaly.
Concept context
The simplest and most abundant element in the universe. Study its unique position in the periodic table, isotopes (protium, deuterium, tritium), properties of water and hydrogen peroxide, and industrial uses.