A) Steam distillation
B) Simple distillation
C) Vacuum distillation
D) Extraction with a solvent
Correct Answer: C
Solution :
The liquids which decompose at its boiling point can be purified by vacuum distillation. Glycerol which decomposes at its boiling point (?563K) can be distilled without decomposition at 453K under 12mm Hg pressure.
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