A) increase the solubility product of III group salts
B) decrease the solubility product of III group salts
C) increase the ionic product of \[\text{O}{{\text{H}}^{-}}\]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\[\text{N}{{\text{H}}_{\text{4}}}\text{Cl}\] is added before \[\text{N}{{\text{H}}_{\text{4}}}\text{OH}\]in basic radical analysis, the dissociation of \[\text{N}{{\text{H}}_{\text{4}}}\text{OH}\]decreases due to common ion effect. It gives only as many \[\text{O}{{\text{H}}^{-}}\]ions which are required for precipitation of group III cations only.
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