Which one of the following is used as a drying agent?
Correct answer: C. CaCl2 anhydrous
- A. NaHCO3
- B. CaCO3.H2O
- C. CaCl2 anhydrous
- D. Na2SO4.H2O
Explanation
CaCl2 (anhydrous calcium chloride): Calcium chloride is a widely used drying agent due to its strong hygroscopic properties. It effectively absorbs moisture from the air, making it useful for drying applications in laboratories, industries, and even for de-icing roads.
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About Sublimation and Distillation
Sublimation separates a sublimable solid from non-sublimable impurities by direct conversion between solid and vapour, followed by deposition. Distillation separates liquids through differences in boiling points, including simple, fractional, steam and vacuum distillation, and the choice depends on volatility, miscibility and thermal stability.
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