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Which of the following is most soluble?

1. Bi2S3 (Ksp = 1 × 10⁻¹⁷)
2. MnS (Ksp = 7 × 10⁻¹⁶)
3. CuS (Ksp = 8 × 10⁻³⁷)
4. Ag2S (Ksp = 6 × 10⁻⁵¹)

Correct answer: MnS (Ksp = 7 × 10⁻¹⁶)

Solution

The solubility of a compound is directly related to its Ksp value. Among the given options, MnS has the highest Ksp (7 × 10⁻¹⁶), making it the most soluble.

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