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Principles Related to Practical Chemistry · Question 27

AIPMT 2005MCQEasy📈 Topic in 50% papers+4−1
1

The best method for the separation of naphthalene and benzoic acid from their mixture is

  1. distillation
  2. sublimation
  3. chromatography
  4. crystallisation.

Answer

(2) sublimation

Solution

As per NCERT, sublimation is used to separate a sublimable compound from a non-sublimable one: on heating, the sublimable solid changes directly into vapour, which condenses back to the solid on cooling.

Naphthalene is volatile and sublimes readily on gentle heating, whereas benzoic acid (held as hydrogen-bonded dimers) remains behind.

∴ Sublimation is the best method for this separation.

Answer: (2)

AIPMT 2005

Keep practising — Principles Related to Practical Chemistry

2

Which of the following is incorrect?

  1. FeCl3 is used in detection of phenol.
  2. Fehling's solution is used in detection of glucose.
  3. Tollens' reagent is used in detection of unsaturation.
  4. NaHSO3 is used in detection of carbonyl compound.
AIPMT 2001
3

In steam distillation of toluene, the pressure of toluene in vapour is

  1. equal to pressure of barometer
  2. less than pressure of barometer
  3. equal to vapour pressure of toluene in simple distillation
  4. more than vapour pressure of toluene in simple distillation.
AIPMT 2001

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