NEET Chemistry MCQ: NCERT Organic Compound Purification | NEET.Guide Questions

A highly impure sample of benzoic acid is contaminated with naphthalene. Which of the following techniques would be LEAST effective for purifying the benzoic acid?

A

Simple distillation

B

Sublimation followed by recrystallization

C

Recrystallization from hot water

D

Treatment with sodium bicarbonate followed by acidification

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Application

🎯Difficulty :Hard

⚡ Time Required :2 mins

🔄Ncert Concepts :Purification techniques, sublimation, recrystallization, distillation, acid-base properties

Related Questions

The substance used as an adsorbent in the column chromatography is:

A

${\rm{N}}{{\rm{a}}_2}{\rm{O}}$

B

${\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}$

C

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}$

D

Alum

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Remembering

🎯Difficulty :Easy

⚡ Time Required :1 mins

🔄Ncert Concepts :column chromatography, adsorbents

A mixture of two organic compounds $A$ and $B$ can be separated by (B. P of $A = {80^0}C$ , B. P of $B = {110^0}C$ )

A

Fractional distillation

B

Simple distillation

C

Sublimation

D

Chromatography

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Application

🎯Difficulty :Easy

⚡ Time Required :2 mins

🔄Ncert Concepts :Separation techniques, Boiling point, Organic compounds

A mixture of benzoic acid and benzamide is dissolved in diethyl ether. Which of the following would be the MOST efficient method to separate the two compounds?

A

Fractional distillation

B

Recrystallization from hot water

C

Extract the ethereal solution with aqueous sodium bicarbonate, then acidify the aqueous layer to recover benzoic acid; evaporate the ether to recover benzamide.

D

Steam distillation

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Application

🎯Difficulty :Hard

⚡ Time Required :2 mins

🔄Ncert Concepts :Acid-base extraction, solubility, separation techniques, benzoic acid, benzamide

Glycerol can be separated from spent-lye in soap industry by

A

Steam distillation

B

Fractional distillation

C

Distillation under reduced pressure

D

Ordinary distillation

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Understanding

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :Separation techniques, Distillation, Boiling point, Vacuum distillation

Which purification technique is MOST suitable for separating a thermally unstable liquid organic compound from a non-volatile impurity?

A

Simple distillation

B

Fractional distillation

C

Steam distillation

D

Vacuum distillation

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Application

🎯Difficulty :Hard

⚡ Time Required :1 mins

🔄Ncert Concepts :Distillation, boiling point, vacuum distillation, purification techniques

Thiophene is separated from benzene by:

A

Chlorination of thiophene

B

Sulphonation of thiophene

C

Nitration of thiophene

D

Oxidation of thiophene

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Understanding

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :electrophilic aromatic substitution, reactivity of thiophene and benzene, organic reactions

When an organic compound is present in aqueous medium and is less soluble in any organic solvent, then it is separated by

A

Continuous extraction

B

Distillation

C

Chromatography

D

Sublimation

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Application

🎯Difficulty :Easy

⚡ Time Required :2 mins

🔄Ncert Concepts :separation techniques, solubility, organic compounds

Which of the following statement is not applicable to Beilstein test?

A

Green or bluish green flame is due to the formation of volatile cupric halides

B

It does not tell us to which halogen is present in the organic compound

C

It is very sensitive test can be easily performed

D

It is a sure test for the presence of halogen

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Analyzing

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :Beilstein test, Halogens, Organic Chemistry, Chemical Tests

Which of the substance is purified by sublimation?

A

Benzoic acid

B

Camphor

C

Naphthalene

D

All of these

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Remembering

🎯Difficulty :Easy

⚡ Time Required :2 mins

🔄Ncert Concepts :Sublimation, Purification

Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?

A

Distillation

B

Zone refining

C

Electrolysis

D

Chromatography

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Purification Of Organic Compounds

🎓 Ncert Level:Remembering

🎯Difficulty :Easy

⚡ Time Required :1 mins

🔄Ncert Concepts :Purification of metals, Physical properties of metals

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