# Separation Processes Questions and Answers – Reverse Osmosis

This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Reverse Osmosis”.

1. Why is osmosis not a good separation process?
a) Because it involves semipermeable membrane
b) Because it transfers solvent from wrong direction
c) Because it involves movement of solute particles
d) Because it requires high temperatures

Explanation: Osmosis is not a good separation technique since it transfers solvent from wrong direction leading to mixing rather than separation.

2. What is the principle of reverse osmosis?
a) The direction of solvent flow Can be reversed by applying pressure greater than osmotic pressure
b) The direction of solvent flow can be reversed by applying pressure less than osmotic pressure
c) The direction of solvent flow can be reversed by using a permeable membrane
d) The solvent flow can be reversed by concentrating the mixture

Explanation: The direction of solvent flow Can be reversed by applying pressure greater than osmotic pressure. Hence P- osmotic pressure = pi.

3. If the Temperature is 300K and the concentration of solute(CB) is 0.5, what is the osmotic pressure?
a) 150R
b) 200R
c) 300R
d) 350R

Explanation: = RTCB, hence = r*300*0.5=150R.

4. If the Temperature is 400K and the concentration of solute(CB) is 0.5, what is the osmotic pressure?
a) 150R
b) 200R
c) 300R
d) 350R

Explanation: = RTCB, hence = r*400*0.5=200R.

5. If the Temperature is 100K and the concentration of solute(CB) is 0.6, what is the osmotic pressure?
a) 150R
b) 200R
c) 600R
d) 60R

Explanation: = RTCB, hence = R*100*0.6=60R.
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6. If the Temperature is 350K and the concentration of solute(CB) is 0.6, what is the osmotic pressure?
a) 150R
b) 167R
c) 175R
d) 350R

Explanation: = RTCB, hence = R*350*0.5=175R.

7. If the Temperature is 300K and the concentration of solute(CB) is 0.75, what is the osmotic pressure?
a) 150R
b) 200R
c) 225R
d) 325R

Explanation: = RTCB, hence = R*300*0.75=225R.

8. If the Temperature is 300K and the concentration of solute(CB) is 0.3, what is the osmotic pressure?
a) 50R
b) 60R
c) 70R
d) 90R

Explanation: = RTCB, hence = R*300*0.3=90R.

9. Which of the following is not a use of reverse osmosis?
a) Treatment of industrial waste water to remove heavy metal ions
b) Separation of sulfites and bisulfites from paper and processing industry effluents
c) Treatment of municipal water to remove inorganic salts
d) Treatment of industrial effluents to decolorize it

Explanation: Reverse osmosis does not decolorize the water.

10. What is a normal tolerance value for concentration polarization coefficient?
a) 0.1
b) 0.2
c) 0.3
d) 0.5

Explanation: If he concentration polarization coefficient is greater than 0.2 then it is considered significant indicating changes in design.

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