Which of the following solutions will not show flow of solvent "in either direction when separated by…
Which of the following solutions will not show flow of solvent "in either direction when separated by semipermeable membrane?
6 g urea $\mathrm{dm}^{-3}$ and 85.5 g sucrose $\mathrm{dm}^{-3}$
15 g urea.dm ${ }^{-3}$ and 34.2 g sucrose $\mathrm{dm}^{-3}$
6 g urea $\mathrm{dm}^{-3}$ and 34.2 g sucrose $\mathrm{dm}^{-3}$
15 g urea $\mathrm{dm}^{-3}$ and 171 g sucrose $\mathrm{dm}^{-3}$
Solution
$\mathrm{n}_{\text {urea }}=\frac{6}{60}=0.1 \mathrm{~mol}$ and $\mathrm{n}_{\text {sucrose }}=\frac{34.2}{342}=0.1 \mathrm{~mol}$
Now, $\mathrm{n}_{\text {urea }}=\mathrm{n}_{\text {sucrose }}$
$\pi_{\text {urea }}=\pi_{\text {sucrose }}$
Hence, if these solutions are separated by a semipermeable membrane, there is no flow of solvent in either direction.