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Passing H(2)S gas into a mixture of Mn^(...

Passing `H_(2)S` gas into a mixture of `Mn^(2+), Ni^(2+), Cu^(2+)` and `Hg^(2+)` ions in an acidified aqueous solution, precipitates :

A

MnS and CuS

B

CuS and HgS

C

MnS and NiS

D

NiS and HgS

Text Solution

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The correct Answer is:
To solve the problem of which ions precipitate when passing H₂S gas into a mixture of Mn²⁺, Ni²⁺, Cu²⁺, and Hg²⁺ ions in an acidified aqueous solution, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Reagent and Conditions**: - The reagent used is H₂S gas in an acidified aqueous solution. The acidified solution is typically made using hydrochloric acid (HCl). 2. **Understand the Group Classification**: - In qualitative analysis, cations are classified into different groups based on their solubility with certain reagents. H₂S is a group 2 reagent, which means it will precipitate certain cations. 3. **Identify Group 2 Cations**: - Group 2 cations that can precipitate with H₂S include Cu²⁺ (copper) and Hg²⁺ (mercury). - Manganese (Mn²⁺) and Nickel (Ni²⁺) belong to group 3 and do not precipitate with H₂S under acidic conditions. 4. **Precipitation Reaction**: - When H₂S is passed into the solution: - Cu²⁺ reacts with H₂S to form copper(I) sulfide (Cu₂S), which is a precipitate. - Hg²⁺ reacts with H₂S to form mercury(II) sulfide (HgS), which is also a precipitate. 5. **Conclusion**: - Therefore, the ions that precipitate from the solution are copper and mercury, forming Cu₂S and HgS respectively. ### Final Answer: The precipitates formed are copper(I) sulfide (Cu₂S) and mercury(II) sulfide (HgS). ---
To solve the problem of which ions precipitate when passing H₂S gas into a mixture of Mn²⁺, Ni²⁺, Cu²⁺, and Hg²⁺ ions in an acidified aqueous solution, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Reagent and Conditions**: - The reagent used is H₂S gas in an acidified aqueous solution. The acidified solution is typically made using hydrochloric acid (HCl). 2. **Understand the Group Classification**: ...
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