250+ TOP MCQs on Extraction-Liquid Liquid Equilibria and Answers

Mass Transfer Problems on “Extraction-Liquid Liquid Equilibria”.

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1. Solvent extraction is basically known as
a) Gas-liquid extraction
b) Liquid- liquid extraction
c) Liquid –solid extraction
d) None of the mentioned

Answer: b
Clarification: The solute in the liquid mixture can be separated with liquid solvent. Also generally extraction is a liquid-liquid operation and the solvent used is a liquid.

2. Liquid-liquid mixture is separated with solvent extraction by adding _______ solvent.
a) Soluble
b) Insoluble
c) Partially soluble
d) All of the mentioned

Answer: b
Clarification: Generally, mass transfer occurs, if an insoluble phase is added to a mixture. In extraction, the insoluble phase is a liquid solvent.

3. Solvent lean phase are known as
a) Extract
b) Raffinate
c) Residue
d) None of the mentioned

Answer: b
Clarification: The extracted solute will be rich in a solvent rich phase known as extract. Remaining small quantity of solute present in the solvent lean phase is known as raffinate.

4. Will it be possible to separate multi-component solution with the help of two solvents.
a) True
b) False

Answer: a
Clarification: There are many other ways to separate multi-components from the liquid solution with the help of two or more solvents.

5. The method of using two solvents is known as double solvent.
a) True
b) False

Answer: a
Clarification: Two solvents are used for multi-component separation is preferably known as double solvent.

6. Fractional extraction is also known as ________
a) Solvent
b) Double solvent
c) Triple solvent
d) None of the mentioned

Answer: b
Clarification: Double solvent extraction is also known as fractional extraction.

7. The composition of substances in the extraction are represented by __________
a) Rectangle
b) Isosceles triangle
c) Equilateral triangle
d) None of the mentioned

Answer: c
Clarification: Sum of perpendicular distance at any point inside the equilateral triangle is 100.