2026 · Q107
Consider the following statements in the light of octane number and cetane number of fuels :
- 1Cetane number is used for gasoline and octane number is used for diesel.
- 2Octane number of n-hexadecane is 100 and cetane number of isooctane is 100.
Which of the statements given above is/are correct?
general-sciencechemistry
- A1 only
- B2 only
- CBoth 1 and 2
- DNeither 1 nor 2
Explanation
Octane number measures knock resistance of gasoline (petrol) and cetane number measures ignition quality of diesel — statement 1 swaps them and is wrong. The reference standards are reversed too: isooctane is assigned octane number 100, while n-hexadecane (cetane) is assigned cetane number 100 — statement 2 is wrong. Hence neither statement is correct.