General Science Chemistry MCQs

Q.  Which of the following is an anti-knocking compound that has been phased out in many countries so far?

a. Lead tetrachloride
b. Tetra Ethyl Lead
c. Ethyl acetate
d. None of the above


ANSWER: See Answer
 
Tetra Ethyl Lead (TEL) is one such component that is added to petrol to reduce its tendency to `ping’ under compression. TEL breaks down to lead at upper cylinder temperatures. Lead atoms spread around and combining with the free radicals and slowing down the reaction.
However, `Leaded’ petrol was a grave danger to the environment, as lead is a poison when it is absorbed into the body.
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