Q. When gasoline is blended with Ethanol then —

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

Which among the above statements is/ are correct?
Answer: 1 & 3
Notes: When gasoline is blended with ethanol, the octane number is indeed raised, which can enhance engine performance. However, the energy content per volume decreases because ethanol has a lower energy density than gasoline. Ethanol can also help reduce engine knocking, making it less likely for the engine to suffer damage. Therefore, the correct statement is that the engine is less likely to suffer damage (statement 3). Trivia: Ethanol is often used in blends like E10 (10% ethanol, 90% gasoline) to improve combustion efficiency and reduce emissions.