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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 option. (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

1. A and D only
2. A and C only
3. C only
4. B and D only

Correct answer: A and C only

Solution

Options A and C are correct because for reverse osmosis to occur, the pressure applied on the more concentrated side (chamber 1) must exceed the osmotic pressure (π) to drive water through the membrane, which is true for both cellophane and parchment paper membranes.

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