Which of the following solutions does not flow in either direction when separated by a semipermeable membrane? (Molar mass: glucose $= 180 \ g \ mol^{-1}$,urea $= 60 \ g \ mol^{-1}$)
- A$18 \ g$ urea $dm^{-3}$
- B$6 \ g$ urea $dm^{-3}$ and $36 \ g$ glucose $dm^{-3}$
- C$6 \ g$ urea $dm^{-3}$ and $24 \ g$ glucose $dm^{-3}$
- D$12 \ g$ urea $dm^{-3}$ and $36 \ g$ glucose $dm^{-3}$
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