in a three way converter, the first converter controls
(a) HC
(b) CO
(c) NOx
(d) all of the above
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Explanation:
Catalytic Converters
Catalytic converters are needed to minimize tailpipe emissions of aldehydes, the primary pollutant resulting from incomplete ethanol combustion, and NOx formation could increase for high-compression engines designed to maximize fuel utilization efficiency.
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