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In a 50% concentration of ethylene glycol (by volume) lowers the freezing point of water to ______Degree Centigrade.(a) -30(b) -50(c) -35(d) -37I had been asked this question at a job interview.Enquiry is from Coolants in chapter Cooling System of Automotive Engine Design

Answer»

Right option is (d) -37

The best I can explain: ETHYLENE glycol interferes with the hydrogen bonding NETWORK in pure water. Water FREEZES at 0°C and pure ethylene glycol at -12°C,due to which 50% concentration of ethylene glycol lowers the freezing point of water to -37 degrees CENTIGRADE.



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