Select the reason behind using unleaded petrol be used with catalytic converters.

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Lead leaves a residue that coats the catalytic metals in the converter, preventing contact with exhaust.

Lead causes conversion of carbon dioxide to carbon monoxide.

Lead in the petrol activates the catalyst and increases the emission of unburnt hydrocarbons.

Lead speeds up the conversion of hydrocarbons are converted into carbon dioxide and water.

answer is C.

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Detailed Solution

If lead is added to the fuel and is burned, it leaves a residue that coats the catalytic metals (Pt, Rh and Pd) and prevents contact with the exhaust fumes, which is necessary in performing the necessary redox reactions. Thus, lead inactivates the catalyst by corrosion.

Lead does not speed up the conversion of hydrocarbons are converted into carbon dioxide and water.

Lead does not cause conversion of carbon dioxide to carbon monoxide.

Lead in the petrol inactivates the catalyst and increases the emission of unburnt hydrocarbons.

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