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Question

Separation of H2O and D2O by fractional distillation is possible because D2O has:

A
higher density than that of H2O
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B
higher boiling point than that of H2O
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C
higher freezing point than that of H2O
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D
lower dielectric constant than that of H2O
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Solution

The correct option is B higher boiling point than that of H2O
If there is a difference in the boiling points of two molecules, then we can separate them by fractional distillation. Since there is a difference in the boiling points of D2O and H2O (D2O has higher boiling point), we can separate them by fractional distillation.

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