Q3 Why can't pure ethyl alcohol be obtained from rectified spirit (95% alcohol) even by factional
distillation?
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I assume that you mean and ethanol/water mixture since there is only a single chemical called ethanol (CH3-CH2-OH).
Ethanol and Water form an azeotropic (see 2) mixture at 96% EtOH. This means both water and Ethanol will boil at exactly the same temperature and have the same ratio (96:4) in both liquid and vapour form.
Since distillation is the separtion of liquids by getting one liquid into vapour form more easily than the other it will fail.
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