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Statement I: Tetraethyl lead is used as an anti-knocking agent in petrol.
Statement II: Tetraethyl lead acts a negative catalyst for the combustion of gasoline.
Both the statements are true and statement II is the correct reason of statement I.
Both the statements are false.
Both the statements are true and statement II is not the correct reason of statement I.
Statement I is false and statement II is true.
Answers (1)
Tetraethyl lead is used to increase the octane number of gasoline because the bond between lead atoms and ethyl group are broken. Upon combustion, the lead forms lead oxide (PbO), which prevents fraction of fuel from burning too quickly. Due to this engine compression being raised, so it acts as negative catalyst and increase the octane number of gasoline.
Hence option 1 is correct.
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