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

Explanation

Option (d) is correct

• Fuel Cell Electric Vehicles (FCEVs) powered by hydrogen use clean and efficient technology. In an FCEV, hydrogen gas reacts with oxygen from the air in a fuel cell to produce electricity.
  This electricity powers the electric motor that propels the vehicle. The only byproduct of this reaction is water vapour (H₂O). So, FCEVs emit clean water vapour instead of harmful pollutants like nitrogen oxides, carbon monoxide, and hydrocarbons typically found in exhaust from gasoline-powered vehicles.

Answer: (d) Water Vapour: Difficulty Level: Easy