IGCSE O Level Chemistry MCQs - Chapter 9
Methods of purification Multiple Choice Questions (MCQ) PDF Download - 2
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Methods of purification Exam Questions and Answers PDF Download: Test 2
While forming crystals, it is important to
- evaporate to dryness to get purest possible crystals
- attach the gas syringes to collect fumes
- not evaporate the water of crystallization
- use high flames
Condensed solid produced during sublimation is
- crystals
- sublimate
- residue
- insoluble
Larger crystals can be obtained if the
- evaporation is at high temperature
- evaporation rate is slow
- evaporation rate is fast
- evaporation speed remains stable
Chromatography can be used to
- form mixtures
- change mixture compositions
- separate mixtures into pure substances
- none of above
The phase that never gains in sublimation is
- solid
- liquid
- gas
- vapors
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