Tetraethyl lead (TEL) is used as
(A) painkiller
(B) fire extinguisher
(C) mosquito repellent
(D) petrol additive
Correct Answer: (D) petrol additive
Explanation:
Tetraethyl lead (TEL) was historically added to petrol (gasoline) to improve engine performance by increasing the octane rating and reducing engine knocking. However, due to its toxic effects and environmental concerns, its use has been phased out in many countries.
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