7. During osmosis A) Pure solvent diffuses through a membrane, but solutes do not. B) Pure solutes diffuse through a membrane, but solvent does not C) Pure solvent and a solution both diffuse at the same time through a membrane. D) Gases diffuse through a membrane into a solution and build up pressure.

Answer: Option A.

Pure solvent diffused through a membrane but solutes do not.

Explanation:

Osmosis is process where solvents or molecules move from a region of low solute concentration to a region of high solute concentration through a semipermeable membrane which tend to balance the concentration of solutes. Osmosis is passive transport i. e it does not require energy for movement.