Answer: Pd absorbs up to 900 times its own volume of H 2 (hydrogen storage) and catalyses hydrogenation.
- A Pd absorbs up to 900 times its own volume of H<sub>2</sub> (hydrogen storage) and catalyses hydrogenation
- B Pd functions as a solid-state electrolyte conducting protons in fuel cells in most textbook accounts
- C Pd forms a passivating oxide layer that prevents hydrogen oxidation largely during normal conditions
- D Pd directly converts adsorbed H<sub>2</sub> gas into hydrogen peroxide as generally observed in typical laboratory settings
Correct answer: A. Pd absorbs up to 900 times its own volume of H<sub>2</sub> (hydrogen storage) and catalyses hydrogenation
Explanation: Palladium uniquely dissolves large amounts of hydrogen into its lattice (forming PdHx), useful for purification and storage. It also catalyses hydrogenation reactions.
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.