Question

The air pollutant not obtained by combustion is}

• A. carbon dioxide
• B. nitrogen dioxide
• C. ammonia
• D. sulphur dioxide

Hint:

Combustion pollutants: CO\textsubscript{2}, NO\textsubscript{x}, SO\textsubscript{2}; Ammonia mainly comes from agriculture, not burning.

Answer 1

The Correct Option is C

Concept: Fuel combustion in engines and industries leads to the formation of several gaseous pollutants, primarily due to oxidation of fuel components and high-temperature reactions with atmospheric nitrogen. Step 1:Identify typical combustion products.
During combustion, carbon-based fuels and impurities undergo oxidation, producing common atmospheric pollutants.
Step 2:Analyze each gas based on its formation pathway.

• Carbon dioxide → Formed by complete combustion of carbon-containing fuels
• Nitrogen dioxide → Produced when atmospheric nitrogen reacts at high temperatures in combustion zones
• Sulphur dioxide → Released when sulphur impurities in fuel are oxidized

Step 3:Evaluate ammonia.
Ammonia is generally associated with biological decomposition and agricultural emissions, not with oxidation reactions in combustion processes. It is not a standard product of fuel burning.