Which of the following is not formed when `H_(2)S` reacts acidic `K_(2)Cr_(2)O_(7)` solution ?

Options

A. `CrSO_(4)`
B. `Cr_(2)(SO_(4))_(3)`
C. `K_(2)SO_(4)`
D. `S`

Answer

To solve the question "Which of the following is not formed when H₂S reacts with acidic K₂Cr₂O₇ solution?", we need to analyze the reaction that occurs between hydrogen sulfide (H₂S) and potassium dichromate (K₂Cr₂O₇) in an acidic medium.

### Step-by-Step Solution:

1. **Identify the Reactants**:
The reactants are hydrogen sulfide (H₂S) and potassium dichromate (K₂Cr₂O₇) in an acidic solution.

2. **Understand the Reaction**:
In acidic conditions, potassium dichromate acts as an oxidizing agent. Hydrogen sulfide (H₂S) can be oxidized to sulfur (S) or sulfate ions (SO₄²⁻).

3. **Write the Balanced Chemical Equation**:
The balanced reaction can be represented as:
\[ 3 H_2S + K_2Cr_2O_7 + 4 H_2SO_4 \rightarrow 3 S + 2 Cr_2(SO_4)_3 + K_2SO_4 + 7 H_2O \]
Here, hydrogen sulfide is oxidized to sulfur, and potassium dichromate is reduced to chromium sulfate.

4. **Identify the Products**:
The products of the reaction are:
- Sulfur (S)
- Chromium(III) sulfate (Cr₂(SO₄)₃)
- Potassium sulfate (K₂SO₄)
- Water (H₂O)

5. **Determine Which Option is Not Formed**:
From the balanced equation, we can see that:
- Sulfur (S) is formed.
- Chromium(III) sulfate (Cr₂(SO₄)₃) is formed.
- Potassium sulfate (K₂SO₄) is formed.
- Water (H₂O) is formed.
- However, **CrSO₄** (Chromium(II) sulfate) is not formed in this reaction.

6. **Conclusion**:
The correct answer to the question is that **CrSO₄** is not formed when H₂S reacts with acidic K₂Cr₂O₇ solution.

### Final Answer:
The option that is not formed is **CrSO₄**.

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