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Lead was removed from petrol chiefly because it

  • A.Increased fuel consumption
  • B.Raised particulate emissions
  • C.Poisons the catalytic converter as well as being a neurotoxin
  • D.Reduced engine power

Answer: C

Lead deposits coat the precious metal sites and destroy the catalyst irreversibly, so unleaded fuel was a precondition for the whole technology. Its own toxicity, particularly to children, made the case unanswerable in any event.

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