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Metal-organic frameworks (MOFs) store hydrogen via ________ adsorption at cryogenic temperatures.
- Chemical
- Physical
- Electrochemical
- Biological
Answer: Physical
Physisorption: weak van der Waals forces bind H₂ to high-surface-area MOFs. Reversible, fast kinetics; challenges: low volumetric density at ambient conditions. Research focuses on optimizing pore chemistry for room-temperature storage. [[NCERT Chemistry Class 12]]