Identify the correct of solubility of Na base 2S, CuS and ZnS in aqueous mediuma. CuS > ZnS > Na base 2Sb. ZnS > Na base 2S > CuSc. Na base 2S > CuS > ZnSd. Na base 2S > ZnS > CuS

(d) 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.