Multiple choice

Tetraethyl lead is used as

  1. mosquito repellent

  2. pain killer

  3. fire extinguisher

  4. petrol additive
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tetraethyl lead (TEL) was historically added to petrol as an anti-knocking agent to improve engine performance by preventing premature fuel combustion. It works by increasing the octane rating of gasoline, allowing for smoother engine operation. The other options are incorrect because TEL is not used as a mosquito repellent, pain killer, or fire extinguisher.

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