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In steam distillation, the liquid boils when the sum of vapour pressure due to organic liquid and due to water becomes ____________

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In steam distillation, the liquid boils when the sum of vapour pressure due to organic liquid and due to water becomes ____________

(a) Greater than atmospheric pressure

(b) Lesser than atmospheric pressure

(c) Equals to atmospheric pressure

(d) None of the mentioned

The question was asked in semester exam.

My question comes from Steam Distillation in portion Methods of Purification of Engineering Chemistry I

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The correct choice is (c) Equals to atmospheric pressure

The explanation is: In steam distillation, the liquid boils when the sum of vapour pressure due to organic liquid and due to water becomes equal to the atmospheric pressure. It is a type of distillation of a liquid in a current of steam, used especially to purify liquids that are not very volatile and are immiscible with water.

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