NEW
Font size
WorksheetsWeek 6 Liquid-liquid extraction
Total questions: 10
Worksheet time: 2mins
The composition of substances in the extraction are represented by ______
Rectangle
Isosceles triangle
Equilateral triangle
None of the mentioned
Liquid-liquid mixture is separated with solvent extraction by adding_____solvent.
Soluble
Insoluble
Partially soluble
All of the mentioned
The number of stages required for a given amount of extraction with a given amount of solvent in continuous cross-current multistage extraction is
equal to the number of stages required in continuous counter-current multistage extraction
more than the number of stages required in continuous counter-current multistage extraction
less than the number of stages required in continuous counter-current multistage extraction
none of the mentioned
Which of the following operations is more economical for concentration of acetic acid from very dilute aqueous solution?
Evaporation
Solvent extraction
Atmospheric distillation
Drying
Operating pressure for liquid extraction should be
sufficiently high to maintain completely condensed system
below the vapour pressures of all the components
equal to the vapour pressure of the most volatile component
equal to the vapour pressure of the least volatile component
Selectivity of a solvent for extraction operation
is analogous to relative volatility in distillation practice
must be less than unity
is 0.5 at the plait point
none of these
In liquid-liquid extraction, if the selectivity is unity, then
separation of the constituents is most effective
no separation is possible
amount of solvent requirement is minimum
solvent flow rate should be very high
As axial mixing increases in a counter-current extractor, the extraction efficiency _______
increases
decreases
remains unchanged
For solvent economy in liquid extraction, the distribution coefficient must be
less than one
equal to one
greater than one
as large as possible
Liquid-liquid extraction is basically known as
Gas-liquid extraction
Solvent extraction
Solute extraction
Solid-liquid extraction
