Which one of the statement(s) given is/are correct about catalytic ...

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Which one of the statement(s) given is/are correct about catalytic converters?
(a) These are fit into automobiles for reducing emission of poisonous gases like \( \mathrm{NO}_{2} \) and \( \mathrm{CO} \)
(b) They have in expensive metals like lead, mercury and rhodium as catalysts
(c) As the exhaust emission passes through catalytic converter, nitric oxide is changed to nitrogen gas, carbon monoxide is oxidised to carbon dioxide and unburnt hydrocarbons get completely burnt into \( \mathrm{O}_{2} \) and \( \mathrm{CO}_{2} \)
(d) Motor vehicles fit with catalytic converter should use leaded petrol because lead in the petrol activates the catalyst
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