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BITSAT 2023Paper 2
Exam
BITSAT
Year
2023
Paper
Paper 2
Subject
Chemistry
Chapter
Solutions

BITSAT 2023 · Paper 2 · Chemistry · Solutions

A 0.5 molal solution of ethylene glycol in water is used as coolant...

A 0.5 molal solution of ethylene glycol in water is used as coolant in a car. If the freezing point constant of water be 1.86∘C1.86^{{}^{\circ}} \mathrm{C} per mole, the mixture shall freeze at

Options

  1. A0.93∘C0.93^{{}^{\circ}} \mathrm{C}
  2. B−0.93∘C-0.93^{{}^{\circ}} \mathrm{C}
  3. C1.86∘C1.86^{{}^{\circ}} \mathrm{C}
  4. D−1.86∘C-1.86^{{}^{\circ}} \mathrm{C}

Correct answer

B. −0.93∘C-0.93^{{}^{\circ}} \mathrm{C}

Step-by-step solution

ΔTf=Kf×m=1.86×0.5=0.93∘C; Tf=−0.93∘C\begin{aligned} &\Delta T_f=K_f \times m=1.86 \times 0.5=0.93^{{}^{\circ}} \mathrm{C} \text{; } \\ & T_f=-0.93^{{}^{\circ}} \mathrm{C}\end{aligned}
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