A) \[CuS\,>\,Zn\,>\,N{{a}_{2}}S\]
B) \[ZnS\,>\,N{{a}_{2}}S\,\,>\,CuS\]
C) \[N{{a}_{2}}S\,\,>\,CuS\,>ZnS\]
D) \[N{{a}_{2}}S\,\,>\,ZnS\,>\,CuS\]
Correct Answer: D
Solution :
| Ionic compounds are more soluble in water or in aqueous medium. |
| Ionic character \[\propto \] 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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