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Distillation

Mediumchemistry

Simple distillation is generally preferred over fractional distillation when:

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Boiling points of liquids differ by about 5 deg C

Both liquids are azeotropic

$B o i l in g p o in t s d i ff er w i d e l y (m ore t hanab o u t 25 d e g C)$

Liquid contains dissolved salts only

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Simple distillation is used to purify liquids having boiling point difference of at least:

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About This Question

Subject: chemistry
Chapter: principles related to practical chemistry
Topic: distillation
Difficulty: Medium
Year: 2025

Solution

Correct Answer:

$B o i l in g p o in t s d i ff er w i d e l y (m ore t hanab o u t 25 d e g C)$

Simple distillation can separate components efficiently when their boiling points are far apart. If boiling points are close, repeated vaporization-condensation steps are needed, so fractional distillation with a fractionating column becomes necessary.

This medium difficulty chemistry question is from the chapter principles related to practical chemistry, covering the topic of distillation. It appeared in the 2025 exam.

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