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

Explanation:

Fuel Cell Electric Vehicles

Here’s an explanation of why water vapour is the exhaust emission from Fuel Cell Electric Vehicles (FCEVs) powered by hydrogen:

1. Fuel Cell Operation: In a hydrogen fuel cell, hydrogen (H2) from the fuel tank reacts with oxygen (O2) from the air.

2. Chemical Reaction: The basic reaction in a hydrogen fuel cell is:
2H2 + O2 -> 2H2O

3. Outputs: This reaction produces two main outputs:
– Electricity (which powers the vehicle)
– Water (H2O)

4. Exhaust: The water produced is in the form of water vapour, which is emitted through the exhaust pipe.

5. Clean Emission: This is why hydrogen fuel cell vehicles are considered “zero-emission” vehicles. The only tailpipe emission is water vapour, which is environmentally benign.

The other options are incorrect:
(a) Hydrogen peroxide (H2O2) is not produced in fuel cells.
(b) Hydronium (H3O+) is an intermediate in some fuel cell reactions but is not an end product.
(c) Oxygen is consumed in the reaction, not produced.