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In wet process (strong sulphuric acid leaching) for the manufacture of orthophosphoric acid the dilute orthophoric acid (40%) is obtained from travelling pan vacuum filter. The dilute orthophosphoric acid (50%) is concentrated economically 75% orthophosphoric acid by using

[A].	an evaporator	[B].	a distillation column
[C].	an extractor	[D].	an adsorption column

Answer: Option A

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