Multiple choice

Which one of the following is an anti-knocking agent added to petrol?

  1. ethyl alcohol

  2. white petrol

  3. tetraethyl lead

  4. butane
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tetraethyl lead (TEL) prevents engine knocking by increasing the fuel's octane rating, allowing for smoother and more controlled combustion in petrol engines.

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