Discussion
Assertion (A): Wet process phosphoric acid is not pure enough for food or detergent use.
Reason (R): It carries fluoride, iron, aluminium and other impurities from the phosphate rock.
Answer: B
Both are true and the reason gives the cause: the furnace process or a solvent purification step is used where a technical or food grade acid is needed. Fluoride is often recovered as a by-product. Purified acid commands a considerably higher price.
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