Identify the correct order of solubility in aqueous medium [NEET-2013]
(1) ZnS > Na2S > Cus
(2) Na2S > Cus > ZnS
(3) Na2S > ZnS > Cus
(4) Cus > ZnS > Na2S
please give the reason why the 3rd option is correct....
I will report if it is not proper explanation
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1
Explanation:
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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