Purification (Crystallization, Sublimation, Distillation,...) NEET Questions

Organic Chemistry - Purification and Characterization of Organic Compounds

Purification (Crystallization, Sublimation, Distillation,...) MCQ Questions


13.
Simple distillation can also be used to separate:
A.
Two solids with similar solubilities
B.
Volatile liquids from non-volatile impurities
C.
Two non-volatile solids
D.
Two gases
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ANSWER :
B. Volatile liquids from non-volatile impurities
14.
In simple distillation, the vapours of which component are formed first?
A.
Higher boiling component
B.
Both simultaneously
C.
Lower boiling component
D.
Component with higher density
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ANSWER :
C. Lower boiling component
15.
Fractional distillation is preferred over simple distillation when:
A.
One of the substances is a solid
B.
The two liquids have very different boiling points
C.
The mixture contains water and aniline
D.
The two liquids have nearly the same boiling points
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ANSWER :
D. The two liquids have nearly the same boiling points
16.
Each successive condensation and vaporisation unit in a fractionating column is called a:
A.
Theoretical plate
B.
Fractional unit
C.
Reflux unit
D.
Equilibrium stage cycle
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ANSWER :
A. Theoretical plate
17.
An important industrial application of fractional distillation is:
A.
Separation of aniline from aniline–water mixture
B.
Separation of glycerol from spent-lye
C.
Purification of camphor
D.
Separation of crude oil into fractions in petroleum industry
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ANSWER :
D. Separation of crude oil into fractions in petroleum industry
18.
In fractional distillation, the vapours rising up the fractionating column become:
A.
Richer in the more volatile (lower boiling) component
B.
Richer in the higher boiling component
C.
Equal in composition to the original mixture
D.
Pure in the higher boiling component
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ANSWER :
A. Richer in the more volatile (lower boiling) component