A) Decrease concentration of \[O{{H}^{-}}\] ions
B) Prevent interference by phosphate ions
C) Increase concentration of \[C{{l}^{-}}\] ions
D) Increase concentration of \[NH_{4}^{+}\] ions
Correct Answer: A
Solution :
As NH4Cl is a strong electrolyte. It supresses the ionization of NH4OH, so the concentration of \[O{{H}^{-}}\] ions in the solution is decreased, but it is sufficient to precipitate the III group basic radicals because the solubility product of III group hydroxides is lower than IV, V and VI group hydroxides. As \[\begin{align} & N{{H}_{4}}OH \\ & N{{H}_{4}}Cl\to \\ \end{align}\]\[\]\[\begin{align} & +O{{H}^{-}} \\ & \underset{\begin{smallmatrix} Common \\ ion\,effect \end{smallmatrix}}{\mathop{+C{{l}^{-}}}}\, \\ \end{align}\]
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