Solve this multiple-choice question and choose the correct option.

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Fuel technology: Tetraethyl lead (TEL) is used as what? Recall its historical role in internal combustion engines. Choose the correct application.

Difficulty: Easy

Petrol additive (antiknock agent)
Pain killer
Fire extinguisher
Mosquito repellent

Correct Answer: Petrol additive (antiknock agent)

Explanation:

Given data

Chemical: Tetraethyl lead (TEL).

Concept/Approach TEL was historically added to gasoline as an antiknock agent to raise octane and reduce engine knocking. Its use has been largely phased out due to toxicity and environmental impact.

Final Answer Petrol additive (antiknock agent)

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