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Question
Name the substance added to petrol to increase the efficiency of the engine.
Answer in Brief
Solution
Tetraethyl lead (TEL) is a chemical added to petrol to improve engine efficiency. However, because of its negative environmental and health impacts, it has been mostly phased out and replaced with safer alternatives such as ethanol or other oxygenates (e.g., MTBE - Methyl Tertiary Butyl Ether) in unleaded gasoline to improve engine efficiency and reduce emissions.
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