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: Combustion of fuels produces several gaseous pollutants depending on fuel composition and conditions. Step 1:Identify pollutants from combustion.}

• Carbon dioxide $\rightarrow$ Produced from burning carbon fuels $\checkmark$
• Nitrogen dioxide $\rightarrow$ Formed at high temperatures $\checkmark$
• Sulphur dioxide $\rightarrow$ From sulphur-containing fuels $\checkmark$

Step 2:Check ammonia.
Ammonia is mainly released from:

• Agricultural activities
• Decomposition of organic matter

It is not produced by combustion. Final Answer: \[ {\text{ammonia}} \]