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Which 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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