Q23 / 160 · AP EAMCET 2022 (05 Jul Shift 2) · Chemistry

Which of the following condition is correct for reverse osmosis? $\left[\mathrm{C}=\right.$ Concentration of solution in $\mathrm{mol} \mathrm{L}^{-1} ; \mathrm{T}=$ Temperature in Kelvin scale; $\mathrm{n}=$ no of moles of solute]

  • A
    $\mathrm{P}_{\mathrm{ext}}=\mathrm{CRT}$
  • Correct answer
    B
    $\mathrm{P}_{\mathrm{ext}}>\mathrm{CRT}$
  • C
    $\mathrm{P}_{\mathrm{ext}} < \mathrm{CRT}$
  • D
    $\mathrm{P}_{\mathrm{ext}}>\mathrm{nRT}$

Solution

In reverse osmosis, the solvent molecules moves from high concentration solution to low concentration solution through a semipermeable membrane when the external pressure exceeds the osmotic pressure.

Hence, the correct answer is option: 'B'.

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