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What happens when noble metals like platinum and palladium are used as a catalyst in catalytic converters?

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What happens when noble metals like platinum and palladium are used as a catalyst in catalytic converters?

(a) They convert the hydrocarbon content into CO2 and H2O

(b) They reduce NOx emissions

(c) They prone to poisoning by lead

(d) They are used to decrease lead content in gasoline

The question was posed to me by my college professor while I was bunking the class.

My query is from Anti Knocking Agents topic in division Fuels and Combustion of Engineering Chemistry II

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The correct answer is (c) They prone to poisoning by lead

Explanation: Catalyst made of noble metals like platinum and palladium are prone to poisoning by lead and also they are very expensive. Catalytic converter ae used to decrease the amount of lead present in gasoline. Using this type of catalyst it can reverse the reaction.

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