How is Hydrogen stored physically?
- AIn form of hydrides
- BIn form of water
- CBy compressing hydrogen gas
- DNone of the above
Show answer and explanation
Correct answer: (c) By compressing hydrogen gas
Explanation
Physical storage of hydrogen means keeping it as a gas or liquid without chemical bonding – done by compressing hydrogen gas to high pressure (350–700 bar) in cylinders.
Storing it as metal hydrides is chemical storage, since hydrogen is chemically bonded to metals like magnesium or nickel.
Water cannot store free hydrogen, so the only physical method listed is gas compression.