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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

NiS and HgS

C

MnS and NiS

D

CuS and HgS

Text Solution

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The correct Answer is:
To solve the problem of what precipitates 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 1: Understand the Reaction When H₂S gas is passed into an acidified solution containing metal ions, it can react to form metal sulfides. The solubility of these sulfides will determine whether a precipitate forms. ### Step 2: Identify the Metal Ions The metal ions in the mixture are: - Mn²⁺ (Manganese) - Ni²⁺ (Nickel) - Cu²⁺ (Copper) - Hg²⁺ (Mercury) ### Step 3: Analyze the Solubility of Metal Sulfides We need to consider the solubility of the sulfides formed by these metal ions: - **CuS (Copper(II) sulfide)**: Very insoluble in water. - **HgS (Mercury(II) sulfide)**: Also very insoluble in water. - **MnS (Manganese(II) sulfide)**: Moderately soluble. - **NiS (Nickel(II) sulfide)**: Moderately soluble. ### Step 4: Determine Which Sulfides Will Precipitate Since H₂S is a weak acid and the concentration of H⁺ ions is low, it will primarily precipitate the most insoluble sulfides: - CuS and HgS will precipitate due to their very low solubility. - MnS and NiS are more soluble and will not precipitate under these conditions. ### Step 5: Conclusion Based on the solubility of the sulfides formed, the precipitates that will form when H₂S gas is passed into the solution are CuS and HgS. ### Final Answer The correct answer is: **CuS and HgS**. ---
To solve the problem of what precipitates 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 1: Understand the Reaction When H₂S gas is passed into an acidified solution containing metal ions, it can react to form metal sulfides. The solubility of these sulfides will determine whether a precipitate forms. ### Step 2: Identify the Metal Ions The metal ions in the mixture are: - Mn²⁺ (Manganese) ...
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