Which one of the following is used as an anti-freeze for the automobile engines?
Reviewed by Dalvoy
UPSC Civil Services preparation
- APropyl alcohol
- BEthanol
- CMethanol
- DEthylene glycolCorrect
Explanation
Ethylene glycol is the correct answer because it is the primary ingredient used in automotive antifreeze. When mixed with water, it lowers the freezing point and raises the boiling point of the engine coolant. This prevents the liquid from freezing in cold temperatures and from overheating in hot conditions. While alcohols like methanol and ethanol have been used in the past, ethylene glycol is preferred today due to its high boiling point and non-volatile nature.
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