Hydrogen fuel cell vehicles produce one of the following as “exhaust”:

1. NH₃
2. CH₄
3. H₂O
4. H₂O₂

Explanation

Option (c) is correct

• Hydrogen fuel cell vehicles generate electricity through an electrochemical reaction between hydrogen and oxygen. The only by-product of this reaction is water. No greenhouse gases or toxic pollutants are produced during this process.

Answer: (c) H₂O