${N H}_{4} C l$ is added alongwith ${N H}_{4} O H$ in group III to decrease concentration of ${O H}^{-}$ ion.

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Solution

${N H}_{4} C l$ is added along with ${N H}_{4} O H$ in group III to decrease concentration of hydroxide. ion.
${N H}_{4} C l$ decreases ionisation of ${N H}_{4} O H$ by common ion effect.
The solubility product of group III radicals is less than that of group IV and group VI hydroxides. Hence, when the ionization of ammonium hydroxide is suppressed, only the group III radicals are precipitated.

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