1.

    Anthraquinone is prepared by the oxidation of anthracene by chromic acid. The crude reaction product is usually purified by

    A

    Fractional Crystallisation

    B

    Distillation

    C

    Steam distillation

    D

    Sublimation

    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 :Purification techniques, Organic chemistry, Sublimation

    Related Questions

    1.

    Which of the following process is not used for the purification of solid impurities?

    A

    Crystallization

    B

    Sublimation

    C

    Chromatography

    D

    Distillation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Separation techniques, Purification of solids, Distillation, Sublimation, Crystallization, Vaporization

    2.

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

    A

    Na2O{\rm{N}}{{\rm{a}}_2}{\rm{O}}

    B

    Na2SO4{\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}

    C

    Al2O3{\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

    3.

    The best method for the separation of naphthalene and benzoic acid from their mixture is

    A

    Chromatography

    B

    Crystallisation

    C

    Distillation

    D

    Sublimation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Separation Techniques, Solubility, Physical Properties

    4.

    Which technique is most effective for separating a 1:1 mixture of ortho-nitrophenol and para-nitrophenol?

    A

    Steam distillation

    B

    Sublimation

    C

    Chromatography

    D

    Simple distillation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    PYQ YEAR: 2017
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Separation Techniques, Hydrogen Bonding, Isomerism

    5.

    Which purification method exploits the difference in boiling points to separate a liquid metal from its impurities?

    A

    Distillation

    B

    Electrolysis

    C

    Chromatography

    D

    Zone refining

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    PYQ YEAR: 2021
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Distillation, Boiling Point

    6.

    Which of the following process is suitable for the purification of aniline?

    A

    Simple distillation

    B

    Fractional distillation

    C

    Fractional crystallisation

    D

    Steam distillation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Purification techniques, Boiling point, Vapor pressure, Steam distillation

    7.

    Which is most commonly used to dry organic liquids?

    A

    Anhydrous magnesium sulfate

    B

    Sodium chloride

    C

    Calcium carbonate

    D

    Potassium permanganate

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :drying agents, organic chemistry, alkali metals

    8.

    Vaccum distillation is used to purify liquids which

    A

    Are highly volatile

    B

    Are explosive in nature

    C

    Decompose below their boiling points

    D

    Have high boiling point

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :vacuum distillation, boiling point, decomposition

    9.

    Which property difference between ortho-nitrophenol and para-nitrophenol is utilized in their separation by steam distillation?

    A

    Melting point

    B

    Solubility in water

    C

    Volatility

    D

    Density

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    PYQ YEAR: 2017
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Separation Techniques, Hydrogen Bonding, Isomerism, Physical Properties

    10.

    In sulphur detection of an organic compound, sodium nitroprusside solution is added to sodium extract. Formation of violet colour is due to

    A

    Na3Fe(CN)6{\rm{N}}{{\rm{a}}_3}{\rm{Fe}}{\left( {{\rm{CN}}} \right)_6}

    B

    Na3[Fe(CN)5NOS]{\rm{N}}{{\rm{a}}_3}\left[ {{\rm{Fe}}{{\left( {{\rm{CN}}} \right)}_5}{\rm{NOS}}} \right]

    C

    Fe(CNS)3{\rm{Fe}}{\left( {{\rm{CNS}}} \right)_3}

    D

    None of these

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Qualitative analysis, Sulphur detection, Coordination chemistry

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