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Q. $K_{f}$ (water) $=1.86 \,K \,kg\, mol ^{-1}$. The temperature at which ice begins to separate from a mixture of $10$ mass $\%$ ethylene glycol is

WBJEEWBJEE 2020

Solution:

$\Delta T_{f}=K_{f} \times m=1.86\left(\frac{10}{62} \times \frac{1000}{90}\right)=3.3^{\circ} C$
$\therefore $ Temparature at which ice begins to separate $=3.3^{\circ} C$