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Name two metals used in a catalytic converter. How do they help in keeping the

environment clean?

Explanation:

Two metals used: Platinum-palladium and Rhodium.

Catalytic converters are recommended for vehicles as these have expensive metals

viz. plantinum-palladium and rhodium as catalysts which are fitted for reducing emission 

of poisonous gases in automobiles. As the exhaust passes through these converters, 

unburnt hydrocarbons are converted into carbon dioxide, water and carbon monoxide

and nitric oxide changes to carbon dioxide and nitrogen gas.

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