Answer: The unknown solution had the higher concentration.
Explanation:
Osmosis is the process where solvent molecules tend to move through a semipermeable membrane from a region of low concentration solution to a region of high concentration.
Also, low concentration of solute means high concentration of solvent, thus water is flowing from high concentration of solvent to low concentration of solvent.
Thus, as the unknown solution level drops, we can say that the concentration of unknown solution was higher as compared to the other solution.
