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Absolute alcohol can be prepared from re...

Absolute alcohol can be prepared from rectified spirit by

A

distillation under reduced pressure

B

azeotropic distillation with benzene

C

Fractional distillation

D

Keeping over fresh CaO for few hours followed by distilling .

Text Solution

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The correct Answer is:
B, D
Absolute alcohol is manufactured from rectified spirit by azeotropic distillation with benzene.On a small scale, in laboratory, absolute alcohol can be prepared by keeping rectified spirit over fresh CaO (which absorbs water) for few hours followed by distillation
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Knowledge Check

  • Absolute alcohol cannot be prepared from rectified spirit by simple distillation because

    A
    the boiling points of water and alcohol are very close
    B
    water and alcohol form a constant boiling azeotropic mixture
    C
    `C_(2)H_(5)OH` forms H-bonds with water
    D
    alcohol molecules are highly hydrated.

  • Absolute alcohol can not be prepared from rectified spirit by simple distillation because

    A
    The boiling points of water and alcohol are very close
    B
    Water and alcohol form a constant boiling azeotropic mixture
    C
    `C_(2)H_(5)OH` forms H-bonds with water
    D
    Alcohols molecules are highly hydrated

  • Absolute alcohol can be obtained from rectified spirit by

    A
    Fractional distillation
    B
    Azeotropic distillation
    C
    Vacuum distillation
    D
    Steam distillation