A) preparation of potash alum
B) the removal of\[PO_{4}^{3-}\]ions
C) increasing the pH value of a solution
D) precipitation of\[Cr{{(OH)}_{3}}\]from\[CrC{{l}_{3}}\]
Correct Answer: B
Solution :
A buffer solution is used in the removal of\[PO_{4}^{3-}\]ions.
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