Ncert Exercises & Solutions

Consider the figure and mark the correct option.

1.	Water will move from the side (B) to side (A) if pressure is lower than the osmotic pressure is applied on piston (B).
2.	Water will move from side (B) to side (A) if a pressure greater than osmotic pressure is applied on piston (B).
3.	Water will move from side (B) to side (A) if a pressure equal to osmotic pressure is applied on piston (B).
4.	Water will move from side (A) to side (B) if pressure equal to osmotic pressure is applied on piston (A).

Hint: pressure that just stops the flow of solvent is called the osmotic pressure of the solution.

If a pressure higher than the osmotic pressure is applied to the solution. the solvent will flow from the solution into the pure

solvent through the semi-permeable membrane. This process is called reverse osmosis.

Thus, in this case, water will move from side (B) to side (A) if a pressure greater than the osmotic pressure is applied on piston (B).