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NEET UG Purification and Characterisation of Organic Compounds — practice questions — page 2

Explore 62 free Purification and Characterisation of Organic Compounds questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Purification and Characterisation of Organic Compounds questions and exercises with answers

Showing questions 31–60 of 62.

Freeze distillation of applejack tends toRead the answer and worked solution →Pervaporation separates liquid mixtures by partial vaporisation throughRead the answer and worked solution →Why can distillation never give a perfectly pure product?Read the answer and worked solution →Cryogenic distillation of air is used to obtain which set of gases?Read the answer and worked solution →In chromatography, the fluid that carries the mixture through the system is theRead the answer and worked solution →Chromatographic separation is based on differences inRead the answer and worked solution →The aim of preparative chromatography is toRead the answer and worked solution →Which botanist developed chromatography to separate plant pigments?Read the answer and worked solution →Martin and Synge shared the 1952 Nobel Prize in Chemistry for establishingRead the answer and worked solution →When plant pigments were first separated by chromatography, the orange band was due toRead the answer and worked solution →In chromatography, the term eluent is synonymous withRead the answer and worked solution →The mixture of solute and solvent leaving a chromatography column is theRead the answer and worked solution →Retention time in chromatography is the time an analyte takes toRead the answer and worked solution →In thin-layer chromatography, the stationary phase is a thin layer of an adsorbent such asRead the answer and worked solution →In column chromatography, the stationary bed is heldRead the answer and worked solution →Flash column chromatography speeds up separation byRead the answer and worked solution →In planar chromatography, which value helps identify an unknown substance?Read the answer and worked solution →On cellulose chromatography paper, which compounds travel the farthest?Read the answer and worked solution →Compared with paper, thin-layer chromatography offersRead the answer and worked solution →Which gas is most often used as the mobile phase in gas chromatography?Read the answer and worked solution →Gas chromatography is unsuitable for proteins mainly becauseRead the answer and worked solution →Liquid chromatography using tiny packing particles at high pressure is calledRead the answer and worked solution →HPLC on silica with toluene as mobile phase is calledRead the answer and worked solution →Under reversed-phase conditions, which kind of molecule leaves the column earliest?Read the answer and worked solution →In size-exclusion chromatography, what elutes first?Read the answer and worked solution →Ion exchange chromatography separates analytes according to theirRead the answer and worked solution →Affinity chromatography separates analytes usingRead the answer and worked solution →In chromatography, the substance to be separated is called theRead the answer and worked solution →Recrystallisation purifies a solid by dissolving it and thenRead the answer and worked solution →During recrystallisation, impurity molecules usually stay in solution because theyRead the answer and worked solution →

Worked practice questions

Freeze distillation of applejack tends to

  1. convert sugar to ethanol
  2. lower the ethanol content
  3. concentrate harmful congeners
  4. remove all the methanol
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Correct answer: C. concentrate harmful congeners

Freezing out water leaves poisonous congeners in the liquid, so they become more concentrated instead of being removed.

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Pervaporation separates liquid mixtures by partial vaporisation through

  1. a bed of silica gel
  2. a non-porous membrane
  3. a packed glass column
  4. a heated copper coil
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Correct answer: B. a non-porous membrane

In pervaporation one component passes through a non-porous membrane while partly vaporising.

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Why can distillation never give a perfectly pure product?

  1. Boiling points shift as liquids heat
  2. Some vapour never reaches the condenser
  3. Condensers always add trace impurities
  4. Others would need zero partial pressure
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Correct answer: D. Others would need zero partial pressure

Every volatile component keeps some partial pressure, so some of it always enters the vapour with the desired one.

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