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During the precipitation fof third group...

During the precipitation fof third group of qualitative analysis ammonium chloride is added before adding ammonium hydroxide. The function of `NH_4CI` is to

A

the `S^(2-)` ion concentration may increase

B

the `S^(2-)` ion concentration may decrease

C

the hydrogen ion concentration may increase

D

the degree of dissociation of HCI may decrease.

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