Q.

Which of the following substance is used to decrease knocking in diesel fuel?

A. tetra ethyl lead
B. benzene
C. sodium hydroxide
D. acetone peroxide
Answer» D. acetone peroxide
Explanation: the knocking in diesel fuel can be reduced by adding substances like ethyl nitrite, ethyl nitrate, isoamyl nitrate etc. this process also increases the cetane number of diesel fuel.
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