Identify the correct order of solubility in a | vedclass

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(B) Ionic compounds are generally more soluble in water or aqueous media.According to Fajans' rule,the covalent character increases with the polarisin

Vedclass · Accepted Answer

$Na_2S > ZnS > CuS$

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(B) Ionic compounds are generally more soluble in water or aqueous media.According to Fajans' rule,the covalent character increases with the polarising power of the cation,which is inversely proportional to the ionic character.Ionic character is higher for cations with larger size and lower charge.The order of size of the cations is $Na^{+} > Zn^{2+} > Cu^{2+}$.Since $Na^+$ has the largest size and lowest charge,$Na_2S$ is the most ionic and thus the most soluble.$CuS$ has the highest covalent character due to the smaller size and higher charge of $Cu^{2+}$,making it the least soluble.Therefore,the correct order of solubility in water is $Na_2S > ZnS > CuS$.

Identify the correct order of solubility in aqueous medium.

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