Anti-freeze for automobile engines — UPSC Prelims PYQ 1997
Which one of the following is used as an anti-freeze for automobile engines?
- Propyl alcohol
- Ethanol
- Methanol
- Ethylene glycol
Explanation
Option (d) is correct
- An anti-freeze is a substance added to the coolant of automobile engines to lower the freezing point and raise the boiling point of the liquid. This prevents the coolant from freezing in cold conditions and overheating in hot conditions, ensuring proper engine functioning. Ethylene glycol is the most commonly used anti-freeze in automobile engines because it has a very low freezing point and a high boiling point when mixed with water. It also provides efficient heat transfer and helps prevent corrosion in the engine cooling system.
Answer: (d) Ethylene glycol
