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In the detection of III group basic radicals $\mathrm{NH}_{4} \mathrm{OH}$ is added after $\mathrm{NH}_{4} \mathrm{Cl}$ to
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decrease in the ionisation of $\mathrm{NH}_{4} \mathrm{OH}$
In the detection of III group, basic radicals $\mathrm{NH}_{4} \mathrm{OH}$ is added after $\mathrm{NH}_{4} \mathrm{Cl}$ to decrease the ionisation of $\mathrm{NH}_{4} \mathrm{OII}$ due to common ion effect.
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