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The solubility products of CuS, Ag2S and HgS are 10⁻³¹, 10⁻⁴⁴, 10⁻⁵⁴ respectively. The solubilities of these sulphides are in the order

1. Ag2S > HgS > CuS
2. Ag2S > CuS > HgS
3. HgS > Ag2S > CuS
4. CuS > Ag2S > HgS

Correct answer: Ag2S > CuS > HgS

Solution

The solubility of a salt is inversely related to its solubility product (Ksp). Since Ag2S has the highest Ksp, it is the most soluble, followed by CuS, and then HgS.

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