Which one of the following is the exhaust pipe emission from Fuel Cell Electric Vehicles, powered by hydrogen?

Which one of the following is the exhaust pipe emission from Fuel Cell Electric Vehicles, powered by hydrogen?
  1. Hydrogen peroxide
  2. Hydronium
  3. Oxygen
  4. Water vapour

Solution

In a hydrogen fuel cell, H2 reacts with O2 (from air) to produce electricity, with water vapour as the only tailpipe emission — 2H2 + O2 -> 2H2O.

Asked in: UPSC Prelims 2024

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