Write one chemical reactions for the preparation of `D_(2)O_(2)`.

Explanation

To prepare D₂O₂ (deuterium peroxide), we can use the following chemical reaction:

1. **Write the reaction**: The preparation of D₂O₂ can be achieved by the reaction of deuterium sulfate (D₂SO₄) with barium oxide (BaO₂). The balanced chemical reaction is:

\[ \text{D}_2\text{SO}_4 + \text{BaO}_2 \rightarrow \text{BaSO}_4 + \text{D}_2\text{O}_2 \]

### Step-by-step Explanation:

1. **Identify the reactants**: The reactants in this reaction are deuterium sulfate (D₂SO₄) and barium oxide (BaO₂).

2. **Determine the products**: The products of the reaction are barium sulfate (BaSO₄) and deuterium peroxide (D₂O₂).

3. **Write the balanced equation**: Ensure that the number of atoms for each element is the same on both sides of the equation. In this case, the equation is already balanced as written.

4. **Conclusion**: The reaction shows that when deuterium sulfate reacts with barium oxide, barium sulfate and deuterium peroxide are formed.