Q. Which of the following happen(s) on blending of gasoline with ethanol?

1. Octane number of the fuel is raised.
2. Energy content per unit volume is increased.
3. The engine is less likely to suffer damage.

Select the correct answer using the codes given below:
Answer: 1 and 3
Notes: The addition of ethanol to gasoline raises the octane number, enhancing anti-knock characteristics (Statement 1). Ethanol allows a more complete combustion, reducing engine damage (Statement 3). However, ethanol has lower energy content than gasoline, so blending decreases, not increases, energy content per volume (Statement 2 is incorrect). Therefore, only Statements 1 and 3 are correct.