For concentrating an aqueous solution of a material like anhydrous Na – McqOptions

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1.	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.
A.	High pressure
B.	Vacuum
C.	Backward feed
D.	None of these
Answer» C. Backward feed

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