The semipermeable membrane is a selective membrane, which allows specific molecules to pass through. In the given question, Tube B will have a high number of dissolved ions.
The answers can be explained as:
(a) The solution and the pure solvent are separated by a semi-permeable membrane, then the osmosis will take place from the region of higher concentration to the lower concentration of the solvent. Tube C will absorb the least amount of water molecules.
(b) The maximum amount of the water molecule dissolved ions will have the highest osmotic pressure. Osmotic pressure is defined as the minimum pressure applied to prevent the backflow of solvent through a semi-permeable membrane.
Thus, tube B will have the maximum amount of dissolved ions.
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