UPSC Prelims 2010·GS1·science-and-technology·science and technology

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

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Last updated 23 May 2026, 3:31 pm IST
  1. ANH₃
  2. BCH₄
  3. CH₂OCorrect
  4. DH₂O₂

Explanation

The correct answer is C because a hydrogen fuel cell generates electricity through a chemical reaction between hydrogen and oxygen. In this process, hydrogen atoms combine with oxygen from the air to produce electrical energy, with pure water vapor being the only byproduct. Since no carbon or nitrogen is involved in the internal reaction, the vehicle emits no harmful gases or greenhouse pollutants, making water the sole exhaust.
science-and-technology: Hydrogen fuel cell vehicles produce one of the following as “exhaust”

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