Question:
Which gas is not emitted due to burning of fossil fuel?
Which gas is not emitted due to burning of fossil fuel?
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Remember: Fossil fuels are hydrocarbons. When burned, they emit water (H2O) and carbon dioxide (CO2), not pure Hydrogen gas (H2).
Updated On: Jun 25, 2026
- Carbon dioxide
- Nitrogen oxide
- Hydrogen
- Ozone
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Concept
The combustion of fossil fuels (coal, oil, natural gas) releases various gases into the atmosphere due to chemical reactions with oxygen.
Step 2: Meaning
Primary emissions are gases directly released from the burning process, while secondary pollutants form later in the atmosphere.
Step 3: Analysis
• Carbon dioxide (CO2) is the primary greenhouse gas emitted directly from the complete combustion of carbon-based fossil fuels.
• Nitrogen oxides (NOx) are directly emitted when nitrogen in the air reacts with oxygen at the high temperatures of combustion.
• Ozone (O3) is a secondary pollutant; it is not directly emitted but forms when NOx and volatile organic compounds (VOCs) react in sunlight.
• Hydrogen (H2) is a clean-burning fuel itself and is not a byproduct or emission of burning fossil fuels.
Step 4: Conclusion
Since hydrogen is not an emission product of fossil fuel combustion, it is the correct answer.
Final Answer: (C)
The combustion of fossil fuels (coal, oil, natural gas) releases various gases into the atmosphere due to chemical reactions with oxygen.
Step 2: Meaning
Primary emissions are gases directly released from the burning process, while secondary pollutants form later in the atmosphere.
Step 3: Analysis
• Carbon dioxide (CO2) is the primary greenhouse gas emitted directly from the complete combustion of carbon-based fossil fuels.
• Nitrogen oxides (NOx) are directly emitted when nitrogen in the air reacts with oxygen at the high temperatures of combustion.
• Ozone (O3) is a secondary pollutant; it is not directly emitted but forms when NOx and volatile organic compounds (VOCs) react in sunlight.
• Hydrogen (H2) is a clean-burning fuel itself and is not a byproduct or emission of burning fossil fuels.
Step 4: Conclusion
Since hydrogen is not an emission product of fossil fuel combustion, it is the correct answer.
Final Answer: (C)
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