Steam Distillation

Question 1

In steam distillation, the liquid boils when the sum of vapour pressure due to
organic liquid and due to water becomes ____________
a) Greater than atmospheric pressure
b) Lesser than atmospheric pressure
c) Equals to atmospheric pressure
d) None of the mentioned

Answer 1

c) Equals to atmospheric pressure

Question 2

The organic liquid in steam distillation vaporizes at ____________
a) Lower temperature than its boiling point
b) Higher temperature than its boiling point
c) At its boiling point
d) None of the mentioned

Answer 2

a) Lower temperature than its boiling point

Question 3

Steam distillation process is used to separate substances which are
____________
a) Steam volatile
b) Steam volatile and immiscible with water
c) Steam volatile and miscible with water
d) All of the mentioned

Answer 3

b) Steam volatile and immiscible with water

Question 4

What type of mixture is collected in round bottom flask after passing through a
steam generator?
a) Mixture of volatile organic compound and water
b) Mixture of nonvolatile organic compound and water
c) Mixture of nonvolatile inorganic compound and steam
d) Mixture of volatile organic compound and steam

Answer 4

d) Mixture of volatile organic compound and steam

Question 5

Which of the following property is not possessed by the organic solvent required
to separate organic compound with water?
a) It is immiscible with water
b) It is less volatile than water
c) It is easily vaporisable
d) Organic compound is more soluble in it

Answer 5

b) It is less volatile than water

Question 6

Which of the following is the upper layer in differential extraction?
a) Solvent layer
b) Solute layer
c) Aqueous layer
d) None of the mentioned

Answer 6

a) Solvent layer

Question 7

When does the organic compound be present in the upper solvent layer in
differential extraction?
a) Before the extraction
b) During the extraction
c) After the extraction
d) It is always present in the upper layer

Answer 7

c) After the extraction

Question 8

The organic compound in differential extraction is recovered from the organic
solvent by ____________
a) Distillation
b) Fractional crystallisation
c) Steam crystallisation
d) Sublimation

Answer 8

a) Distillation

Question 9

The pure solvent after the differential extraction cannot be used again for the
extraction.
a) True
b) False

Answer 9

b) False

Question 10

Aniline is separated from aniline-water mixture using ____________
a) Fractional distillation
b) Fractional crystallisation
c) Steam distillation
d) All of the mentioned

Answer 10

c) Steam distillation