UPSC CSE Prelims
Question 38
Which one of the following is the exhaust pipe emission from Fuel Cell Electric Vehicles, powered by hydrogen ?
View correct answer and explanation
Correct answer: D
Correct Option: D (Water vapour)
Explanation: A hydrogen fuel-cell vehicle combines hydrogen with oxygen electrochemically, generating electricity and releasing water, usually as vapour, at the tailpipe.
Option-wise Analysis:
A. Incorrect-Hydrogen peroxide is not the normal fuel-cell exhaust product.
B. Incorrect-Hydronium (H₃O⁺) describes solvated protons in water, not a tailpipe emission.
C. Incorrect-Oxygen is taken in as a reactant rather than exhausted as the reaction product.
D. Correct-water vapour/water is the principal exhaust emission.