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← ScienceWhich outcome reduces NO levels when lean-burn engines exhibit decreased exhaust temperatures?
A)Increased catalyst light-off time
B)Shift in equilibrium constants✓
C)Enhanced thermal decomposition reactions
D)Promoted hydrocarbon oxidation activity
💡 Explanation
Lower exhaust temperatures shift NO equilibrium in favor of decreased production because thermodynamic favorability changes the reaction rate; therefore equilibrium constants drive the outcome with temperature changes, rather than temperature enhancing decomposition by itself.
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