A solution which is 10⁻³ M each in Mn ²⁺, Fe ²⁺, Zn ²⁺ and Hg ²⁺ is treated with 10⁻¹⁶ M sulphide ion. If the K _ sp of MnS, FeS, ZnS and HgS are 10⁻¹⁵, 10⁻²³, 10⁻²⁰ and 10⁻⁵⁴ respectively, which one will precipitate first?

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Correct answer: C. HgS

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A solution which is 10⁻³ M each in Mn ²⁺, Fe ²⁺, Zn ²⁺ and Hg ²⁺ is treated with 10⁻¹⁶ M sulphide ion. If the K _ sp of MnS, FeS, ZnS and HgS are 10⁻¹⁵, 10⁻²³, 10⁻²⁰ and 10⁻⁵⁴ respectively, which one will precipitate first?

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