For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a _______________ evaporator?
Correct answer: B. Vacuum
- A. High pressure
- B. Vacuum
- C. Backward feed
- D. None of these
Explanation
Vacuum evaporation lowers the boiling temperature, which is suitable for materials whose solubility decreases as temperature rises. It also reduces the risk of unwanted crystallisation or thermal damage.
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