Reagent used in the qualitative analysis of IVth group of basic radicals is
For detection of Group IV basic radicals, is added in presence of . This is done to increase the concentration of Sulphide ions in the solution as the Group IV cations have a larger value of their Solubility products.
In presence of , the dissociation of is increased due to acid base reaction. This provides sufficient for precipitation of Group IV cations.
Hence, the correct answer is Option (2)
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