A) less ionised
B) highly ionized
C) not ionised
D) none of these
Correct Answer: B
Solution :
The cation of II group (\[H{{g}^{2+}}+P{{b}^{2+}},B{{i}^{3+}},C{{u}^{2+}}\]etc.) and IV group \[(N{{i}^{2+}},C{{o}^{2+}},M{{n}^{2+}},Z{{n}^{2+}})\] are precipitated as their sulphides. Precipitation of II group cation group require low concentration of sulphide so HCl is added to the original solution before passing \[{{H}_{2}}S\]gas (common ion effect). For precipitation of IV group cations large concentration of \[{{S}^{2-}}\] is required in order that ionic product exceed solubility product NOTE: Solubility product of II group sulphides is less than that of IV group sulphide)
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