Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side.
Reason (R):	Diffusion of solvent occurs from a region of high concentration solution to a region of low concentration solution.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: solvent molecules pass through it from the pure solvent side to the solution side. Solvent molecules always flow from lower concentration to higher concentration of the solution.

Osmosis is the spontaneous net movement or diffusion of solvent molecules through a selectively permeable membrane from a region of high water potential to a region of low water potential, in the direction that tends to equalize the solute concentrations on the two sides.

When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from the pure solvent side to the solution side. Solvent molecules always flow from lower concentration to higher concentration of the solution.

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