Which one of the following is the exhaust pipe emission from Fuel Cell Electric Vehicles, powered by hydrogen?
Answer
The correct answer is D: Water vapour. Fuel Cell Electric Vehicles (FCEVs) powered by hydrogen produce only water vapour as their exhaust emission. In a hydrogen fuel cell, hydrogen reacts with oxygen from the air through an electrochemical process: 2H₂ + O₂ → 2H₂O + electricity + heat.
A.Hydrogen peroxide
B.Hydronium
C.Oxygen
D.Water vapour✓ Correct
Explanation
Fuel Cell Electric Vehicles (FCEVs) powered by hydrogen produce only water vapour as their exhaust emission. In a hydrogen fuel cell, hydrogen reacts with oxygen from the air through an electrochemical process: 2H₂ + O₂ → 2H₂O + electricity + heat. This makes hydrogen FCEVs zero-emission vehicles at the tailpipe, with water vapour being the only byproduct. This is one of the main environmental advantages of hydrogen fuel cell technology over internal combustion engines.
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