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In the precipitation of group III in qua...

In the precipitation of group III in qualitative analysis ammonium chloride is added before adding `NH_4OH` to :

A

decrease the concentration of `OH^(-)`

B

increase concentration of `Cl^(-)`

C

prevent interference of `PO_4^(3-)`

D

increase the concentration of `NH_4^(+)` .

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The correct Answer is:
A
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