alleryThe byproduct of a hydrogen-oxygen fuel cell (used in space + electric cars) is:
AWater (H2O), making it clean energy
BCarbon dioxide (greenhouse gas)
CSulphur dioxide (acidic gas)
DNitrogen oxides (smog component)
Answer & Solution
Correct answer: A. Water (H2O), making it clean energy
**Reaction:** 2H2 + O2 → 2H2O.
Only byproduct is WATER, making H2-O2 fuel cells the cleanest energy source.
Used in NASA Apollo missions, Toyota Mirai EVs.
Hydrogen economy explores this for clean transport.
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