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← ScienceWhich outcome occurs when an IC engine runs lean?
A)Increased nitrogen oxide formation occurs.✓
B)Incomplete fuel combustion increases sharply.
C)Carbon monoxide emission proportionally decreases.
D)Hydrocarbon emission simultaneously increases vastly.
💡 Explanation
Increased temperature leads to faster reaction kinetics; because excess oxygen allows increased nitrogen oxidation via the Zeldovich mechanism, therefore more pollutant gases are produced, rather than fuel wasting products formed from incomplete reaction.
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