BPSC – Combined Competitive Examination · প্রশ্ন 137
Which compound has been used to increase the octane rating of petrol?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (C) Tetraethyl lead
ব্যাখ্যা
Tetraethyl lead (TEL) reduces engine knocking and raises octane number; it has been phased out due to lead pollution.
- (A) ভুল
Wrong: not the classic anti-knock additive.
- (B) ভুল
Wrong: not a standard additive.
- (C) সঠিক
Correct: TEL was the classic anti-knock agent (now phased out for health reasons).
- (D) ভুল
Wrong: not a standard additive.