NEET UG Purification and Characterisation of Organic Compounds — practice questions — page 3

Explore 62 free Purification and Characterisation of Organic Compounds questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Purification and Characterisation of Organic Compounds questions and exercises with answers

Showing questions 61–62 of 62.

In simple recrystallisation, a hot saturated solution near the solvent's boiling point is thenRead the answer and worked solution →In two-solvent recrystallisation, solvent and antisolvent must beRead the answer and worked solution →

Worked practice questions

In simple recrystallisation, a hot saturated solution near the solvent's boiling point is then

frozen rapidly
boiled to dryness
filtered hot only
cooled slowly

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Correct answer: D. cooled slowly

Slow cooling makes the hot saturated solution supersaturated, so pure crystals nucleate and grow.

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In two-solvent recrystallisation, solvent and antisolvent must be

both non-volatile liquids
miscible with each other
immiscible with each other
equally polar liquids

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Correct answer: B. miscible with each other

The antisolvent has to mix with the first solvent so that it lowers the product's solubility throughout the solution.

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