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For Binary salts like CuS & HgS, solubility s = √Ksp ⇒ sCuS = √10^-31 = 3.16 × 10^-16, sHgS = √10^-54 = 10^-27 For Ag2S → 2Ag+ + S2- (s) Ksp = 4s^3 or sAg2S = (Ksp / 4)^(1/3)

1. sCuS = √10^-31 = 3.16 × 10^-16
2. sHgS = √10^-54 = 10^-27
3. Ksp = 4s^3 or sAg2S = (Ksp / 4)^(1/3)
4. The order is Ag2S > CuS > HgS

Correct answer: The order is Ag2S > CuS > HgS

Solution

The solubility order is determined by the Ksp values. Ag2S has the highest solubility due to its cubic dependence on Ksp, followed by CuS and then HgS.

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