In which among the following reactions does `H_(2)SO_(4)` show oxidizing property?

Options

A. `Zn+H_(2)SO_(4) to ZnSO_(4) +H_(2)`
B. `C+2H_(2)SO_(4) to 2H_(2)O +2SO_(2) + CO_(2)`
C. `2KOH +H_(2)SO_(4) to K_(2)SO_(4) + 2H_(2)O`
D. `CuSO_(4) .5H_(2)O to CuSO_(4) +5H_(2)O`

Explanation

To determine in which reaction sulfuric acid (H₂SO₄) shows oxidizing properties, we need to analyze the given options and identify the reactions where H₂SO₄ acts as an oxidizing agent.

### Step-by-Step Solution:

1. **Understanding Oxidizing Agents**:
- An oxidizing agent is a substance that gains electrons in a chemical reaction, causing another substance to be oxidized. In this case, we need to identify if H₂SO₄ is gaining electrons or increasing the oxidation state of another element.

2. **Analyzing the Reactions**:
- We need to look at each option provided in the question to see if H₂SO₄ is involved in a reaction where it can oxidize another substance.

3. **Option 1**: Reaction of H₂SO₄ with a metal.
- If H₂SO₄ reacts with a metal, it can oxidize the metal, increasing its oxidation state. This is a potential reaction where H₂SO₄ acts as an oxidizing agent.

4. **Option 2**: Reaction of H₂SO₄ with carbon (C).
- When carbon reacts with H₂SO₄, it can be oxidized to carbon dioxide (CO₂). The oxidation state of carbon changes from 0 in elemental carbon to +4 in CO₂. Therefore, H₂SO₄ is acting as an oxidizing agent here.

5. **Option 3**: Reaction of H₂SO₄ with a base (like KOH).
- This is a neutralization reaction where H₂SO₄ reacts with KOH to form K₂SO₄ and water. There is no change in oxidation states, so H₂SO₄ is not acting as an oxidizing agent.

6. **Option 4**: Dehydration reaction.
- In the reaction of H₂SO₄ with copper(II) sulfate pentahydrate (CuSO₄·5H₂O), H₂SO₄ is acting as a dehydrating agent, removing water but not changing the oxidation state of copper. Thus, it does not show oxidizing properties here.

7. **Conclusion**:
- The reaction where H₂SO₄ shows oxidizing properties is when it reacts with carbon to form CO₂. Therefore, the correct answer is **Option 2**.

### Final Answer:
**H₂SO₄ shows oxidizing properties in the reaction with carbon (C) to form carbon dioxide (CO₂).**

---