EASY
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In thin layer chromatography, a substance moved by a distance of where as the solvent moved by a distance of . Then the value of retardation factor is
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Important Questions on Organic Chemistry- Some Basic Principles and Techniques
EASY
The species that exhibits the highest value in a thin layer chromatogram using a nonpolar solvent on a silica gel plate is:
HARD
A solution of chloroaniline, chlorophenol, and chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of to give fraction . The leftover organic phase was extracted with a dilute solution to give a fraction . The final organic layer was labelled as a fraction . Fractions and contain respectively:
MEDIUM
A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of benzanilide aniline and acetophenone. When the column is eluted with a mixture of solvents, hexane:ethyl acetate , the sequence of obtained compounds is:
EASY
Paper chromatography is an example of
MEDIUM
The most suitable method of separation of mixture of ortho and para-nitrophenol is:
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Glycerol is separated in soap industries by :
MEDIUM
A flask contains a mixture of isohexane and -methylpentane. One of the liquids boils at while the other boils at What is the best way to separate the two liquids and which one will be distilled out first?
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Which of the following mixtures can be separated by simple distillation?
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The distillation technique most suited for separating glycerol from spent - lye in the soap industry is:
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The principle of column chromatography is:
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A liquid compound (x) can be purified by steam distillation only if it is
MEDIUM
The elution sequence of a mixture of compounds containing chlorobenzene, anthracene and -cresol developed from an alumina column using a solvent system of progressively increasing polarity is
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Which of the following processes for refining of metals involves a principle of selective adsorption of the components from a mixture.
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The correct match between Item I and Item II is:
| Item I | Item II |
| Benzaldehyde | Mobile phase |
| Alumina | Adsorbent |
| Acetonitrile | Adsorbate |
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Aniline is insoluble in water and possesses a vapour pressure of at . It can be conveniently purified by
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Given below are two statements:
Statement : A mixture of chloroform and aniline can be separated by simple distillation.
Statement : When separating aniline from a mixture of aniline and water by steam distillation aniline boils below its boiling point.
In the light of the above statements, choose the most appropriate answer from the options given below:
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The organic compound which can be purified by steam distillation is :
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In chromatography, which of the following statements is incorrect for ?
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Which of the following statements is not true about partition chromatography?
EASY
If Dichloromethane (DCM) and water are used for differential extraction, which one of the following statements is correct?
