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.

    Fractional crystallisations is carried out to separate a mixture of

    A

    Organic solids mixed with inorganic solids

    B

    Organic solids slightly soluble in water

    C

    Organic solids having small difference in their solubilities in suitable solvent

    D

    Organic solids having great difference in their solubilities in suitable solvent

    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 :Fractional Crystallization, Solubility, Separation Techniques

    2.

    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

    3.

    Absolute alcohol cannot be obtained by simple fractional distillation because

    A

    Pure C2H5OH{{\rm{C}}_2}{{\rm{H}}_5}{\rm{OH}} is unstable

    B

    C2H5OH{{\rm{C}}_2}{{\rm{H}}_5}{\rm{OH}} forms hydrogen bonds with water

    C

    Boiling point of C2H5OH{{\rm{C}}_2}{{\rm{H}}_5}{\rm{OH}} is very close to that of water

    D

    Constant boiling azeotropic mixture is formed with water

    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 :azeotropes, fractional distillation, intermolecular forces

    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.

    A mixture of oo-nitrophenol and pp-nitrophenol can be separated by

    A

    Fractional crystallisation

    B

    Sublimation

    C

    Chemical separation

    D

    Steam 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, Boiling Point, Intramolecular Hydrogen Bonding, Intermolecular Hydrogen Bonding

    6.

    Fractional crystallisations is carried out to separate a mixture of

    A

    Organic solids mixed with inorganic solids

    B

    Organic solids slightly soluble in water

    C

    Organic solids having small difference in their solubilities in suitable solvent

    D

    Organic solids having great difference in their solubilities in suitable solvent

    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 :Fractional Crystallization, Solubility, Organic Solids, Separation Techniques

    7.

    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

    8.

    Some organic compounds are purified by distillation at low pressure because the compounds are

    A

    Low boiling liquids

    B

    high boiling liquids

    C

    highly volatile

    D

    dissociated before reaching their boiling points

    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 :distillation, vapor pressure, thermal decomposition, boiling point

    9.

    Differential extraction is based on the difference in:

    A

    Boiling points of the compounds

    B

    Melting points of the compounds

    C

    Solubility of the compound in different solvents

    D

    Molecular weights of the compounds

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Purification, Differential Extraction

    10.

    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

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