NextMockதேர்வுகளைத் தேடுங்கள், எ.கா. SSC CGL, UPPSC, Lekhpal
State PCS PYQPrelims 2025

BPSC – Combined Competitive Examination · வினா 137

Which compound has been used to increase the octane rating of petrol?

  1. Trimethylhexane
  2. Tetramethyl oxide
  3. Tetraethyl lead
  4. Triethyl toluene
விடையைக் காட்டு & விளக்கம்

விடை: (C) Tetraethyl lead

விளக்கம்

Tetraethyl lead (TEL) reduces engine knocking and raises octane number; it has been phased out due to lead pollution.

  • (A) தவறு

    Wrong: not the classic anti-knock additive.

  • (B) தவறு

    Wrong: not a standard additive.

  • (C) சரி

    Correct: TEL was the classic anti-knock agent (now phased out for health reasons).

  • (D) தவறு

    Wrong: not a standard additive.