1.

    A student attempts to purify a mixture of aniline and nitrobenzene by steam distillation. Which compound will distill over first, and why?

    A

    Nitrobenzene, due to its higher molecular weight

    B

    Aniline, due to its lower boiling point and formation of less extensive hydrogen bonds with water compared to nitrobenzene

    C

    Both will distill over simultaneously as they form an azeotropic mixture

    D

    Nitrobenzene, because it is less volatile than aniline

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Steam distillation, intermolecular forces, boiling point, aniline, nitrobenzene

    Related Questions

    1.

    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

    2.

    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, Crystallization, Sublimation, Distillation, Chromatography

    3.

    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

    4.

    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

    5.

    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

    6.

    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

    7.

    A mixture of aniline and water can be effectively separated using:

    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 :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Purification, Organic Chemistry, Distillation, Steam Distillation, Aniline

    8.

    Which of the following techniques is NOT typically used for the purification of organic liquids?

    A

    Distillation

    B

    Fractional distillation

    C

    Sublimation

    D

    Chromatography

    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, Organic Chemistry, Distillation, Sublimation, Chromatography

    9.

    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

    10.

    Which method is used to purify liquids that decompose at or below their boiling points?

    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 :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Purification, Organic Chemistry, Distillation, Vacuum distillation

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