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NEET UG Purification and Characterisation of Organic Compounds — practice questions

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 1–30 of 62.

Distillation separates the components of a liquid mixture byRead the answer and worked solution →Distillation separates substances by exploiting differences in theirRead the answer and worked solution →Destructive distillation of wood was historically a source of which alcohol?Read the answer and worked solution →Laboratory-scale distillations are almost always run in which mode?Read the answer and worked solution →In batch distillation, the fractions are collected in which order?Read the answer and worked solution →A liquid boils when its vapour pressure becomes equal toRead the answer and worked solution →Idealised distillation models rest mainly on which two laws?Read the answer and worked solution →Which liquid pair behaves close to the idealised distillation model?Read the answer and worked solution →As batch distillation of two volatile liquids proceeds, the boiling point of the remaining liquidRead the answer and worked solution →When an ideal two-liquid mixture boils, the vapour is enriched inRead the answer and worked solution →In continuous distillation, product purity depends mainly on reflux ratio andRead the answer and worked solution →In a distillation column, the term reflux meansRead the answer and worked solution →For a given separation, a column with a low reflux ratio mustRead the answer and worked solution →A fractionating column improves separation mainly byRead the answer and worked solution →In a still, the purified liquid collected in the receiver is called theRead the answer and worked solution →Why is a distillation set-up usually left open at one point?Read the answer and worked solution →Which method best recovers a pure liquid from a solution of a non-volatile solid?Read the answer and worked solution →Fractional distillation is needed when the liquids in a mixture haveRead the answer and worked solution →Separation by successive distillations in a fractionating column is also known asRead the answer and worked solution →Adding more theoretical plates to a fractionating column generally givesRead the answer and worked solution →Steam distillation is mainly used for distilling compounds that areRead the answer and worked solution →Steam distillation of aromatic flowers gives an essential oil andRead the answer and worked solution →To distil a compound with a very high boiling point, chemists usuallyRead the answer and worked solution →Vacuum distillation is most commonly seen in laboratories in the form of theRead the answer and worked solution →Molecular distillation is vacuum distillation carried out below what pressure?Read the answer and worked solution →Which apparatus is used in codistillation to remove water from synthesis products?Read the answer and worked solution →To dry ethanol beyond its azeotrope with water, a desiccant can be added such asRead the answer and worked solution →The ethanol-water azeotrope at 78.1 °C contains about what mass percent ethanol?Read the answer and worked solution →Water and toluene, being immiscible, form an azeotrope that boilsRead the answer and worked solution →Which mixture is an example of a high boiling azeotrope?Read the answer and worked solution →

Worked practice questions

Distillation separates the components of a liquid mixture by

  1. selective freezing and melting
  2. precipitating one part with a reagent
  3. selective boiling and condensation
  4. filtering through a fine membrane
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Correct answer: C. selective boiling and condensation

Distillation boils the mixture selectively and then condenses the vapours, so components separate by how easily they vaporise.

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Distillation separates substances by exploiting differences in their

  1. electrical charge
  2. solubility in water
  3. relative volatility
  4. density as liquids
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Correct answer: C. relative volatility

Components that vaporise more readily are enriched in the vapour, so relative volatility drives the separation.

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Destructive distillation of wood was historically a source of which alcohol?

  1. Glycerol
  2. Ethanol
  3. Propanol
  4. Methanol
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Correct answer: D. Methanol

Methanol came from heating wood in destructive distillation, which is why it is called wood alcohol.

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Amines and BiomoleculesChemical KineticsAldehydes, Ketones and Carboxylic AcidsEquilibriumRedox ReactionsHydrocarbonsChemical Bonding and Molecular StructureSolutions