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Q.

An azeotropic mixture of water(b.pt=1000c) and HCl (b.pt = 850C) boils at 108.50c. When this mixture is distilled, it is possible to obtain

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a

Pure water

b

Neither HCl nor H2O in pure state

c

Pure HCl

d

Both HCl & water

answer is D.

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Detailed Solution

BP of H2O = 100oc

BP of HCl = 85oc

BP of (HCl+H2O) azeotrope = 108.5oc

It is a maximum boiling azeotrope

It is not possible to separate the components of an azeotrope

Because both the components boil at same temperature

An azeotrope is a constant boiling mix.

\therefore neither HCl nor H2O can be obtained in pure state by fractional distillation

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