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Solution


Q.

XY is the membrane / partition between two chambers 1 and 2 containing sugar solutions of concentration c1 and c2 (c1>c2) mol L-1. For the reverse osmosis to take place identify the correct condition

(Here p1 and p2 are pressures applied on chamber 1 and 2)

(A)  Membrane/Partition ; Cellophane, p1>π

(B)  Membrane/Partition ; Porous, p2>π

(C)  Membrane/Partition ; Parchment paper, p1>π

(D)  Membrane/Partition ; Cellophane, p2>π

Choose the correct answer from the option given below :
1 B and D only  
2 A and D only  
3 A and C only  
4 C only  

Ans.

(3)

During osmosis, solvent moves from low concentration solution to high concentration solution, across a semipermeable membrane. For reverse osmosis, we need to apply a pressure greater than osmotic pressure, on solution of high concentration, so that solvent moves against natural flow of osmosis i.e. from high concentration (c1) to low concentration (c2).