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In a 50% concentration of ethylene glycol (by volume) lowers the freezing point of water to ______Degree Centigrade.

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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) -37

I had been asked this question at a job interview.

Enquiry is from Coolants in chapter Cooling System of Automotive Engine Design

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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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