Correct Answer: Option B

Explanation

knocking, in an internal-combustion engine, sharp sounds caused by premature combustion of part of the compressed air-fuel mixture in the cylinder.

Knocking is a phenomenon that occurs in a gasoline engine if the fuel used does not have a high enough octane rating.

Anti – knocking agents are chemical compounds added in the fuels that help in effective combustion.

An antiknock agent is a gasoline additive used to reduce engine knocking and increase the fuel's octane rating by raising the temperature and pressure at which auto-ignition occurs.

Examples are: 

• Methylcyclopentadienyl manganese tricarbonyl (MMT)
• Ferrocene.
• Iron pentacarbonyl.
• Toluene.
• Isooctane.

• Ethanol boosts the octane number of fuel, which helps prevent pre-ignition knock.

• Organic lead (tetraethyl lead) is used as an antiknock agent in gasoline and jet fuels.

• what is the fluid in the eye calles? Answer this

  1 Answers   ·   Biological Science   ·   8 hours ago
• which school is the richest school in Nigeria? Answer this

  1 Answers   ·   1 day ago
• how does post utme looks like and what are the subjects required for a medical student? Answer this

  1 Answers   ·   1 day ago