JEE Main 2022 · 30 Jul · Shift 2 · Chemistry Q53

ChemistryInteger+4 / -1Question 53 of 90

31 g of ethylene glycol is mixed with 500 g of water. The freezing point of the aqueous solution is _______ K. (in nearest integer)

(K $_f$ of water = 1.86 K kg mol $^{-1}$ )

[Molar mass of C, H, O are 12, 1, 16 g mol $^{-1}$ ]

Your answer

Answer and worked solution

Official answer: 271

Molality $\frac{31/62}{0.5}=1$ m: $\Delta T_f=1.86$ K, so the freezing point is $273.15-1.86\approx271$ K.

Answer: 271

JEE Main 2022 · 30 Jul · Shift 2, Chemistry question 53