Which of the following is laboratory preparation of dihydrogen?

Options

A. `3Fe + 4H_(2)O(steam) rarr Fe_(3) O_(4) + 4H_(2)`
B. `2Na + 2H_(2)O rarr Ca(OH)_(2) + 2H_(2)`
C. `CaH_(2) + 2H_(2)O rarr Ca (OH)_(2) + 2H_(2)`
D. `Zn + H_(2)SO_(4)(dil.) rarr ZnSO_(4) + H_(2)`

Explanation

To solve the question regarding the laboratory preparation of dihydrogen, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a laboratory method to prepare dihydrogen (H₂).

2. **Identify Common Laboratory Methods**: In chemistry, dihydrogen can be prepared through various methods. Some common laboratory methods include:
- Reaction of metals with acids.
- Electrolysis of water.
- Reaction of metals with water.

3. **Evaluate the Given Options**: Since the question provides options, we need to evaluate each option to determine if it describes a laboratory preparation of dihydrogen.

4. **Recall the Reaction**: One of the well-known laboratory methods for preparing dihydrogen is the reaction of zinc (Zn) with dilute sulfuric acid (H₂SO₄):
\[ \text{Zn} + \text{H}_2\text{SO}_4 \rightarrow \text{ZnSO}_4 + \text{H}_2 \]
In this reaction, zinc reacts with dilute sulfuric acid to produce zinc sulfate and dihydrogen gas.

5. **Identify the Correct Option**: Based on the reaction mentioned above, if one of the options corresponds to this reaction, that option will be the correct answer.

6. **Conclusion**: After evaluating the options, we find that the correct answer is the one that represents the reaction of zinc with dilute sulfuric acid, which is option D.

### Final Answer:
The laboratory preparation of dihydrogen is represented by the reaction:
\[ \text{Zn} + \text{H}_2\text{SO}_4 \rightarrow \text{ZnSO}_4 + \text{H}_2 \]
Thus, the correct option is **D**.

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