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

Organic Chemistry - Purification and Characterization of Organic Compounds

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


7.
Sublimation is the process in which a solid:
A.
Melts to liquid and then evaporates
B.
Dissolves in a solvent
C.
Directly changes into vapour state without passing through liquid state
D.
Decomposes on heating
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ANSWER :
C. Directly changes into vapour state without passing through liquid state
8.
Which of the following compounds can be purified by sublimation?
A.
Glucose
B.
Camphor
C.
Sodium chloride
D.
Urea
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ANSWER :
B. Camphor
9.
The technique of sublimation is used to separate:
A.
Sublimable solids from non-sublimable impurities
B.
Two volatile liquids
C.
Two miscible liquids of close boiling points
D.
An organic compound from aqueous solution
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ANSWER :
A. Sublimable solids from non-sublimable impurities
10.
A suitable technique for separation of components from a mixture of camphor and calcium sulphate is:
A.
Steam distillation
B.
Distillation
C.
Sublimation
D.
Crystallisation
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ANSWER :
C. Sublimation
11.
Simple distillation is suitable for separating:
A.
Solids of different solubilities
B.
Steam-volatile compounds from water
C.
Two liquids with very close boiling points
D.
Two liquids having sufficient difference in their boiling points
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ANSWER :
D. Two liquids having sufficient difference in their boiling points
12.
Which pair of liquids can be conveniently separated by simple distillation?
A.
Methanol (338 K) and ethanol (351 K)
B.
Chloroform (334 K) and aniline (457 K)
C.
Acetone (329 K) and methanol (338 K)
D.
Benzene (353 K) and toluene (384 K)
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ANSWER :
B. Chloroform (334 K) and aniline (457 K)