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NA2S>ZnS>CuS
The correct order of solubility of Na
2
S,CuS and ZnS in aqueous medium is Na
2
S>ZnS>CuS. Sodium salts are highly soluble in water and thus of Na
2
S shows highest solubility. The K
sp
value of CuS is less than ZnS and thus, ZnS is more soluble than the former.
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