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

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

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Why is it desirable to use unleaded petrol in vehicles fitted with catalytic converters?

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Lead in petrol inactivates the catalysts (platinum, palladium and rhodium) which convert harmful pollutants (CO, unburnt hydrocarbons, nitric oxide) to lesser harmful pollutants (CO2 , H2O, N2).

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