WBJEE · Chemistry · Solutions
\(\mathrm{K}_{f}\) (water) \(=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\). The temperature at which ice begins to separate from a mixture of 10 mass \(\%\) ethylene glycol is
- A \(-1.86^{\circ} \mathrm{C}\)
- B \(-3.72^{\circ} \mathrm{C}\)
- C \(-3.3^{\circ} \mathrm{C}\)
- D \(-3^{\circ} \mathrm{C}\)
Answer & Solution
Correct Answer
(C) \(-3.3^{\circ} \mathrm{C}\)
Step-by-step Solution
Detailed explanation
Hint: \(\Delta \mathrm{T}_{\mathrm{f}}=\mathrm{K}_{\mathrm{f}} \times \mathrm{m}\) \(=1.86\left(\frac{10}{62} \times \frac{1000}{90}\right)\) \(=3.3^{\circ} \mathrm{C}\) \(\therefore\) Temparature at which ice begins to separate \(=3.3^{\circ} \mathrm{C}\)
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