H ₂ ~S is passed into one nm ³ of a solution containing 0.1 mole of Zn ²⁺ and 0.01 mole of Cu ²⁺ till the sulphide ion concentration reaches to 8.1 10⁻¹⁹ moles. Which one of the following statements is true? [K_ sp . of ZnS and CuS are 3 10

Question

H ₂ ~S is passed into one nm ³ of a solution containing 0.1 mole of Zn ²⁺ and 0.01 mole of Cu ²⁺ till the sulphide ion concentration reaches to 8.1 10⁻¹⁹ moles. Which one of the following statements is true? [K_ sp . of ZnS and CuS are 3 10⁻²² and 8 10⁻³⁶ respectively.]

Quantrex Academy · Accepted Answer

Correct answer: B. Both CuS and ZnS precipitate

The ionic product for ZnS (0.1 8.1 10⁻¹⁹ ) and for CuS (0.01 8.1 10⁻¹⁹ ) exceeds their K_ sp values. Hence, both get precipitated.

H ₂ ~S is passed into one nm ³ of a solution containing 0.1 mole of Zn ²⁺ and 0.01 mole of Cu ²⁺ till the sulphide ion concentration reaches to 8.1 10⁻¹⁹ moles. Which one of the following statements is true? [K_ sp . of ZnS and CuS are 3 10⁻²² and 8 10⁻³⁶ respectively.]

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