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COMEDK2012ChemistryIonic Equilibrium

On passing H ₂ ~S into a solution containing both Zn ²⁺ and Cu ²⁺ in acidic medium, only CuS gets precipitate(d) This is because

Options

  1. AK_ sp of CuS < K_ sp of ZnS
  2. BK_ sp of CuS =K_ sp of ZnS
  3. CK_ s p of CuS >K_ sp of ZnS
  4. DCuS is more stable than ZnS

Correct answer

A. K_ sp of CuS < K_ sp of ZnS

Step-by-step solution

On passing H ₂ ~S into a solution containing Zn ²⁺ and Cu ²⁺ ions, ZnS and CuS are formed. The solubility product of CuS is less than that of ZnS . CuS get precipitated.

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