Railway Recruitment Board General Awareness — Question 1624

Question

Which harmful gas is emitted by motor-vehicle exhaust due to incomplete combustion of fuel?

  1. Carbon monoxide
  2. Oxygen
  3. Nitrogen
  4. Hydrogen

Correct answer

A — Carbon monoxide

Explanation (English)

Incomplete combustion of fuel in automobile engines releases carbon monoxide, a major toxic pollutant.

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