tetrahedral lead added to petrol act as
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Answer:
When petrol burns inefficiently or engine get cools down due to very slow speed then knocking occurs.
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Explanation:
Tetra ethyl lead (C2H5)4Pb is added to petrol and it's act as a negative catalyst but still it's added Why? ... So by adding TEL(Tetra Ethyl lead) we can rise octane value of the fuel but it slows down the burning of fuel so it seems to be negative catalyst but still it's added because it minimise knocking.
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