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Why is the use of unleaded petrol recommended for motor vehicles equipped with catalytic converters?

Explanation:

Lead-free petrol can reduce the pollutants that motor vehicles emit. Catalytic converters are fitted in automobiles to reduce emission of poisonous gases . These metals (platinum-palladium) convert unburnt hydrocarbons into carbon dioxide and water and similiarly carbon monoxide and nitric oxide are converted into carbon dioxide and nitrogen gas respectively. Catalytic converters are effective only when unleaded petrol is used because lead in the petrol inactivates the catalyst in the converters.

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