The third group radicals are precipitated as hydroxides by means of NH4OH in presence of NH4Cl because
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a
NH4OH activates NH4Cl
b
NH4Cl decreases the ionization of NH4OH
c
NH4Cl increases the ionization of NH4OH
d
Ksp of NH4OH is more than that of NH4Cl
answer is B.
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Detailed Solution
NH4Cl exerts common ion effect and suppresses the dissociation of NH4OH. The third group radicals require a low concentration of OH- for precipitate formation.