Q29 / 100 · BITSAT 2023 (Memory Based Paper 2) · Chemistry

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 $1.86^{\circ} \mathrm{C}$ per mole, the mixture shall freeze at

  • A
    $0.93^{\circ} \mathrm{C}$
  • Correct answer
    B
    $-0.93^{\circ} \mathrm{C}$
  • C
    $1.86^{\circ} \mathrm{C}$
  • D
    $-1.86^{\circ} \mathrm{C}$

Solution


$\begin{aligned} &\Delta T_f=K_f \times m=1.86 \times 0.5=0.93^{\circ} \mathrm{C} \text {; } \\ & T_f=-0.93^{\circ} \mathrm{C}\end{aligned}$

Hence, the correct answer is option: 'B'.

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