Q25 / 150 · MHT CET 2022 (08 Aug Shift 1) · Chemistry

Calculate freezing point of a 0.05 molal aqueous solution of a nonelectrolyte?

  • A
    186 K
  • Correct answer
    B
    272.9 K
  • C
    93 K
  • D
    278 K

Solution

$\begin{aligned} \Delta T_f & =K_f \times m \\ & =1.86 \times 0.02 \\ & =0.093 \mathrm{~K} \end{aligned}$ or $T_f-T=0.093$ $\begin{aligned} T & =273-0.093 \\ & =272.9 \mathrm{~K} \end{aligned}$

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

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