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What is the correct order of solubility of NiS, CuS and ZnS in aqueous medium?
Sodium salts are highly soluble. Cu^2+ belongs to the II^nd group in salt analysis and is precipitated as CuS, whereas Zn^2+ belongs to the IV group and is precipitated as ZnS after CuS because of higher K base sp of ZnS. Hence Na2S > ZnS > Cus
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