Civil Services Prep

Prelims 2024 · Science and Technology · Question 97

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

Answer

Water vapour

  • (a) Hydrogen peroxide: Fuel-cell vehicles do not emit hydrogen peroxide from the exhaust. In a hydrogen fuel cell, hydrogen reacts with oxygen to produce electricity, heat, and water. Verdict: Incorrect.
  • (b) Hydronium: Hydronium ion exists in aqueous chemistry, not as an exhaust emission from hydrogen fuel-cell vehicles. Verdict: Incorrect.
  • (c) Oxygen: Oxygen is a reactant taken from air in the fuel cell; it is not the main exhaust emission. Verdict: Incorrect.
  • (d) Water vapour: The net reaction in a hydrogen fuel cell is hydrogen + oxygen -> water, along with electricity and heat. Hence the exhaust is mainly water vapour. Verdict: Correct.
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