Which is the best drying agent in desiccators?
Correct answer: C. CaCl2
- A. KOH
- B. Gypsum
- C. CaCl2
- D. Silica sand
Explanation
The anhydrous calcium chloride will absorb any water (including condensation, vapour etc) in its environment. It effectively traps that water by changing its molecular make-up.
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About Filtration and Crystallisation
Filtration separates an insoluble solid from a liquid using gravity or suction, while crystallisation purifies a soluble solid by forming crystals from a concentrated solution. The work includes selecting filter media, hot and cold filtration, evaporation, cooling, seeding and washing crystals, and explains why crystallisation is preferred over complete evaporation for purification.
Practise Experimental Techniques in Chemistry
79 free Experimental Techniques in Chemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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