A) \[CuS>ZnS>N{{a}_{2}}S\]
B) \[ZnS\text{ }>\text{ }N{{a}_{2}}S>CuS\]
C) \[N{{a}_{2}}S>CuS\text{ }>ZnS\]
D) \[N{{a}_{2}}S\text{ }>\text{ }ZnS\text{ }>\text{ }CuS\]
Correct Answer: D
Solution :
Ionic compounds are more soluble in water or in aqueous medium. Ionic character oc size of cation (if anion is same) The order of size of cation is \[N{{a}^{+}}>Z{{n}^{2+}}>C{{u}^{2+}}\] \[\therefore \]The order of ionic character and hence, of solubility in water is as \[N{{a}_{2}}S>ZnS>CuS\]
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