A) increase the solubility product of \[III\] group salts
B) decrease the solubility product of \[III\] group salts
C) increase the ionic product of \[O{{H}^{-}}\] and \[III\] group radicals
D) decrease the degree of ionisation of group reagent
Correct Answer: D
Solution :
Key Idea: The compounds precipitate only when their solubility products are less than their ionic products. When \[N{{H}_{4}}Cl\] is added before \[N{{H}_{4}}OH\] in basic radical analysis, the dissociation of\[N{{H}_{4}}OH\] decreases due to common ion effect. It gives only as many \[O{{H}^{-}}\] ions which are required for precipitation of group \[III\] cations only.
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