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The boiling point of ethylene glycol used in the coolant is ______Degree Centigrade

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The boiling point of ethylene glycol used in the coolant is ______Degree Centigrade

(a) 290

(b) 195

(c) 200

(d) 300

I had been asked this question in an interview for internship.

This intriguing question originated from Coolants in section Cooling System of Automotive Engine Design

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Right answer is (b) 195

Easy explanation: The boiling point is the temperature at which the vapor pressure of a chemical equals atmospheric pressure. The boiling point of ethylene glycol is 195-degree Centigrade and used as coolant in automobiles. The higher boiling point indicates greater intermolecular force therefore less vapor pressure.

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