In the analysis of $III$ group basic radicals of salts,the purpose of adding $NH_4Cl_{(s)}$ to $NH_4OH$ is
- Ato increase the concentration of $OH^{-}$ ions
- Bto precipitate the radicals of group $IV$ and $V$
- Cto suppress the dissociation of $NH_4OH$
- Dto introduce $Cl^{-}$ ions
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