Solubility of $C u S (I), Z n S (I I)$ and $N a_{2} S (I I I)$ in water is in order?

I < I I < I I I

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I I I < I < I I

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I I < I < I I I

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None of the above

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Solution

The correct option is A $I < I I < I I I$
Ionic compounds are more soluble in water.
Ionic character $\propto$ Size of cation
The order of size of cation is
$N a^{+} > Z n^{2 +} > C u^{2 +}$
$∴$ The solubility in water is in order of
$N a_{2} S > Z n S > C u S$
$I I I > I I > I$

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