Multiple choice general knowledge science & technology

Earlier, leaded petrol used to be the most widespread, though easily preventable, source of urban air pollution in the world. According to WHO (World Health Organization), 15–18 million children in the developing countries are already suffering from permanent brain damage due to lead poisoning. Why is tetra-ethyl lead added to petrol?

  1. It prevents engine knocking

  2. Reduces vehicular emissions

  3. Increases life of motor tyres

  4. None of the above
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A Correct answer
Explanation

Tetra-ethyl lead was added to petrol as an anti-knock agent - it prevents premature fuel ignition (engine knocking) by increasing the octane rating. Lead additives do not reduce emissions or improve tire life; they were phased out due to severe neurological health impacts.

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