1.

    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

    Related Questions

    1.

    Which of the following fractions obtained in fractional distillation of coal-tar contains benzene and toluene?

    A

    Light oil

    B

    Heavy oil

    C

    Middle oil

    D

    Green oil

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Remembering
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :fractional distillation, coal tar, aromatic hydrocarbons, benzene, toluene

    2.

    Ellution is the process for:

    A

    Crystallization of compound

    B

    Separation of compound

    C

    Extraction of compound

    D

    Distillation of compound

    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 :Chromatography, Separation Techniques

    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.

    Lassaigne's test is used for the detection of

    A

    Carbon only

    B

    Hydrogen only

    C

    Oxygen only

    D

    Nitrogen, sulphur and halogens

    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 :Lassaigne's test, qualitative analysis, detection of elements

    5.

    Paper chromatography is an example of:

    A

    Adsorption chromatography

    B

    Partition chromatography

    C

    Thin layer chromatography

    D

    Column chromatography

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    PYQ YEAR: 2020
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :chromatography, separation techniques

    6.

    The most suitable method of separation of 1 :1 mixture of ortho and para – nitrophenols is

    A

    Steam distillation

    B

    Sublimation

    C

    Chromatography

    D

    Crystallisation

    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, Intermolecular forces, Isomers

    7.

    Which method is used to separate sugars?

    A

    Fractional crystallisation

    B

    Sublimation

    C

    Chromatography

    D

    Benedict’s reagent

    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 :separation techniques, chromatography

    8.

    In estimation of nitrogen by Duma's method 1.18 g of an orgainc compound gave 224 mL of N2{N_2} at NTP. The percentage of nitrogen in the compound is

    A

    20

    B

    11.8

    C

    47.7

    D

    23.7

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Duma's method, stoichiometry, molar volume of gas, percentage composition

    9.

    Fractional distillation is useful in distillation of

    A

    Petroleum

    B

    Coal-tar

    C

    Crude alcohol

    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 :1 mins
    🔄Ncert Concepts :fractional distillation, petroleum, coal-tar, crude alcohol

    10.

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

    A

    Distillation

    B

    Sublimation

    C

    Crystallisation

    D

    Vaporisation

    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 :Separation Techniques, Purification Methods

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