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Identify the correct order of solubility in aqueous medium:

1. ZnS > Na2S > CuS
2. Na2S > ZnS > CuS
3. CuS > ZnS > Na2S
4. Na2S > CuS > ZnS

Correct answer: Na2S > ZnS > CuS

Solution

The solubility of sulfides in water depends on their ionic nature and lattice energy. Na2S, being an alkali metal sulfide, is highly soluble, while ZnS and CuS are sparingly soluble due to their higher lattice energies. Among ZnS and CuS, ZnS is slightly more soluble.

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