Give balanced equations to show the preparation of hydrogen by the following:
iron

Explanation

To prepare hydrogen gas using iron, we can follow these steps:

### Step 1: Identify the Reactants
We will use iron (Fe) and a strong acid, such as sulfuric acid (H₂SO₄), as our reactants.

### Step 2: Write the Unbalanced Equation
The unbalanced chemical equation for the reaction between iron and sulfuric acid is:
\[ \text{Fe} + \text{H}_2\text{SO}_4 \rightarrow \text{FeSO}_4 + \text{H}_2 \]
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