A buffer solution is used in

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preparation of potash alum

the removal of PO4-3 ions

increasing the pH value of a solution

precipitation of Cr(OH)3 from CrCl3

answer is B.

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Detailed Solution

The above reaction serves as a test to quality the presence of Mg+2 in a salt sample.The combinaiton (NH4OH + (NH4)2CO3) is a basic buffer.

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