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Question

(B) Tetraethyl lead $(TEL)$ was historically added to petrol as an antiknock agent. However,its combustion leads to the deposition of lead oxide in th

Vedclass · Accepted Answer

Ethylene dibromide

Vedclass · Answer

(B) Tetraethyl lead $(TEL)$ was historically added to petrol as an antiknock agent. However,its combustion leads to the deposition of lead oxide in the engine. To prevent this,ethylene dibromide $(C_2H_4Br_2)$ is added to the petrol. It reacts with lead oxide to form volatile lead bromide $(PbBr_2)$,which is expelled from the engine through the exhaust.

The chemical added to petrol to prevent the deposition of lead in the combustion chamber is ............... .

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