EASY
Earn 100

Read the statements carefully and choose the right option.

Assertion : Chromatography is used to separate a mixture of plant pigments.
Reason: Chromatography is used for the separation of coloured substances into individual components.

36.84% studentsanswered this correctly

Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
The most suitable method of separation of 1:1 mixture of ortho and para-nitrophenol is:
EASY
Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
If Dichloromethane (DCM) and water H2O are used for differential extraction, which one of the following statements is correct?
EASY
Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
The species that exhibits the highest Rf value in a thin layer chromatogram using a nonpolar solvent on a silica gel plate is:
MEDIUM
Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
The elution sequence of a mixture of compounds containing chlorobenzene, anthracene and p -cresol developed from an alumina column using a solvent system of progressively increasing polarity is
MEDIUM
Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
A flask contains a mixture of isohexane and 3 -methylpentane. One of the liquids boils at 63oC while the other boils at 60oC. What is the best way to separate the two liquids and which one will be distilled out first?
HARD
Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
A solution of m- chloroaniline, m- chlorophenol, and m- chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of NaHCO3 to give fraction A . The leftover organic phase was extracted with a dilute NaOH solution to give a fraction B . The final organic layer was labelled as a fraction C . Fractions A,B and C, contain respectively:
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
The correct match between Item I and Item II is:
 
Item I Item II
A Benzaldehyde P Mobile phase
B Alumina Q Adsorbent
C Acetonitrile R Adsorbate
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
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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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
Paper chromatography is an example of
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Given below are two statements:

Statement I: A mixture of chloroform and aniline can be separated by simple distillation.

Statement II: 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:

MEDIUM
Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of A benzanilide B aniline and C acetophenone. When the column is eluted with a mixture of solvents, hexane:ethyl acetate 20:80 , the sequence of obtained compounds is:
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
The principle of column chromatography is:
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
Glycerol is separated in soap industries by :
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
Which of the following statements is not true about partition chromatography?
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
A liquid compound (x) can be purified by steam distillation only if it is
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
Which of the following mixtures can be separated by simple distillation?
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
Aniline is insoluble in water and possesses a vapour pressure of 10.15 mmHg at 373 K. It can be conveniently purified by
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Given below are two statements:
Statement-I: Retardation factor Rf can be measured in meter/centimetre.

Statement-II: Rf value of a compound remains constant in all solvents.

Choose the most appropriate answer from the options given below:

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
In chromatography, which of the following statements is incorrect for Rf?
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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds
The distillation technique most suited for separating glycerol from spent - lye in the soap industry is: